fromCooperThe'lholmakei4!1TheCooper GroupCOOPER BOKER"CRESCENT"LUFKlN"NICHOLSON"Pl..UMB"WEU.ER WISSXCB.1TE 'INCUSTIUlS P.O.Box 728, Apex. North Carolina27502.Tel: (919) 362-751QTelex: 579497CIRCLE33 ON FREE INFORMATION CARDNEWPRODUCTSurround your body or your work place withion-controlled freshair inAmerica'sfirstbipolar electrostatic home precipitator.1o

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. 0 THAT Dept.RA One JS&APlazaNorthbrook,11I .60062 (312) 564-7000Call TOLL-FREE 800 228-5000In Nebraska Call 800 323-6400 JS&A Group,lnc. ,1981balanced amountof negativeions to create acontrolled ion environment. One emitterproduces negativeions and the other controlsand shapes those ions to create an ion bubble.The end result is a unit which leaves just therightamount of negativeions in a large room,attractsthe pollution particles anddepositsthem on a washable collector plate while keep-ingyour floorsandwallsfreeof dirt .You'reactually placedin a freshair bubble while youwork, sleep or relax and with no uncomfortableelectrostatic charge.I urgeyouto trythe JS&Aiongeneratorinyour homeorofficefor30days. Put oneonyourdeskor in any smoke-filled room. Noticethe refreshing difference in your work environ-ment. Takeit home and plug it in next to yourbed. Chances are, you'llwant to buy anotherone before our 30-day trial period ends.SATISFACTIONGUARANTEEDButif youare not pleased with your unit forany reasonwhatsoever, please return it within30 days andwe'll send you aprompt andcourteousrefundincludingyour $4.00post-age and handling . JS&A is America's premiereelectronics company-a substantial organi-zationthat guarantees your satisfaction.Toorder, sendyour checkfor$89.95plus$4.00postage and handling(Illinoisresidentsplease add 6% sales tax) or credit card buyersmay call our toll-free service line below.We'll send you the JS&A ion generatorcomplete with instructions and a 90-day limit-ed warranty. Then plug it in and leave it run allday and night. The cost to run the unit is only afew cents per day.Theeraof the iongenerator as a standardhousehold appliance is here. Order thenewest and best unit available at no obligation,today .Fresh AirBubbleYoucaneasilyremoveandwashorsimplyreplacethe ion filter after it col/ects the soot.Extra filters are only $1.00 each and should bereplaced or washed once every two months.That'sthehistory . But likeanynewtech-nology, there's sure to be improvements. Thefirst ion generator produced negativelycharged ionswhich attached themselvestothepollutants and then fell to the ground. Youended upwithclean, freshair but alsodirtyrugs and walls.In winter, the units created electrostaticdischarges which can be uncomfortable whentouching a door knob or someone else.CONTROLLEDIONENVIRONMENTSo American scientists created an iongenerator using a bipolar emitter which emitsCIRCLE51 ON FREE INFORMATION CARDcan be found in polluted environments, airconditioned office buildings andinautomo-biles . Many scientists believe that positiveionsmakeyou feel moody, depressed, irrita-ble and restless. Anegative ion generatorcancelsout thepositiveionsandfillstheairwithnegative ions.ANEXPERIMENTWhen you blow smoke into an inverted glassbowl and put it over anion generator, thesmokeimmediately vanishes. Or if youplacethe iongeneratorinanodor-filled room, theroom soon smells fresh.It was these experimentsthat really con-vinced thepublic that the JS&A ion generatorwasa valuable new home appliance. Soon themarket wasfloodedwith competitive ion gen-erators.Many werenot as efficient as JS&A'sfirst model. Someemittedveryfewionsandone actually emitted dangerous levels ofozone. JS&Aconducted independent labor-atory tests andpublicizedtheresults whichshowed that JS&A's unit was indeed the best.The unitmeasures only2" x 4 " x7" anditsblack appearance will fit into most decor.There's a danger . And this invisible menacewill affect nearly everybody reading this ad.The danger is pollution -but not the ordinarykind. In fact, ten years ago, we didn't have thisnew kind of pollution. Let us explain.Ten years ago, cars didn't havecatalyticconverters. Today, thesecatalyticconverters"grindup" thecar exhaust intoparticles sosmall theyformmicronsoot, and micron sootis so fine, it can beeasilyabsorbedinto yourlungs . Even the EPA has stated, "Because it issofine, suchsoot particles stay longer andcausemore damage in the respiratory tract.". Ten years ago, homes were able to"breathe" or exchangeair betweentheout-doorsandindoors four or fivetimesaday.Today, withour well-insulated energy-consci-ous buildingsour homes literally createandtrap pollution that we breathe unwittingly.OTHERPROBLEMSThereare other problems too. Add the dailysoot, dust, smokeandother impuritiesin theair and you've created pollution problemsevenworsethan they were ten years ago-sobad in fact that environmental groups areespecially concerned over this new "timebomb"'lurking in our environment.But Americaningenuityhasn't beensittingstill . Arashof small devicescontainingchar-coal filters with fans and selling for around $30haveliterally flooded the market. The problemis that thesedevicesonlyremoveparticles5microns or larger.Today'smicronsoot is onemicronorsmaller. Cigarettesmoke for exam-ple is 2 to 3 microns or smaller.70,000UNITSSOLDIn1978, JS&Aintroduced thenegativeiongenerator ina national advertising campaignand sold over 70,000 units. It was a device thatcleanedtheairbyelectrostaticallyremovingpart iclesevensmaller thanonemicron. Hos-pital burn centers soon began usingcom-mercial versions of the negative ion generator .Removing sub micronparticlesfrom the airwasveryimportant, but therewasalso a sur-prisingsecondbenefit. Theunit addedneg-atively charged ions to the air.We've all felt theeffectsof negative ionsafter a thunderstorm. Whenyoutakea deepbreath , the air smells good and you feel good.Theoppositeis trueof positiveions whichTHE MULTIMETERLINE OF THE 80'SOutstanding Features, Quality and Design:Lowest Prices.The PriceHit }The ProfessionalTheExclusiveTheWinner of "if 80"lieBROWNSOVERIUNE OF MULTIMETERSANALOG DIGITALlH ID2H 203E 3050FROM $74.00 TO $595.00f "Designedby PorscheCall or write for additional information on our RECORDUCIRCLE63 ON FREE INFORMATION CARDU.S.A.BBC - METRAWATI/GOERZRaritan Center165 Fieldcrest AvenueEdison, N.]. 08837Dh_"".o"'llo .,')n1\ ..,..,c. JlJliJt T.-I ..... "' . OA All ":] 1CANADARADIONICSLIMITEDScarborough. Ontario (416) 2 9 ~Montreal, Quebec (514) 335-1Ottawa, Ontario (613) 521-8\1 .... _ _ n,.. fL.n.' ...,"'"" ..,adi.-IlealTHEMAGAZINEFORNEWIDEASINELECTRONICSElectronicspubli sherssince 1908 OCTOBER1981 Vol. 52 No. 10SPECIALSECTIONBUILDTHIS51 YOUR OWN COMPUTER:What YouShouldKnowBefore YouBuy. Scott Parker54 What toLook for in a Personal Computer61 Floppy DisksAddVersatility71 All AboutPrinters78 Modems-ComputingviaTelephone83 SettingUpa System45 HIFIANALOGREVERBSYSTEMPart 2. Finishingupthi s audio- enhancement device that addsambiencetoyour listenin groom. Carl SawtellON THECOVERFlat-screen displays to maketruly-portable, or " skinny" large-screen, TV's have been longawaited. Now, not one, but two,totally different means for achiev-ingthat goal havebeendemon-strated in working prototypes.Thestoryof howthosedisplaysfunctionstartsonpage39.SPECIALCOMPUTERSECTIONexplainswhattolook forinsettingupasystemfor homeorbusinessuse. Thesectionbeginsonpage51.Duetolack of spaceinthisissue, Part3 oftheProgramma-2RFgeneratorproject will appearnext month. We apologize forany inconveniencethat may cause.MANY FINE RECORDINGS have been madewithout using noise-reduction techniques. Adynamic noise-reductionsystemcan improvetheir sound. Find out howtheprocessworksstartingonpage 90.oo-toOJm:n/Radio-Elect ron ics, (ISSN 0033-7862) Published month lyby Gernback Publi cati ons. Inc.. 200 Park Avenue Sout h.New York, NY10003. Second-Class PostagePai datNewYork, N.Y. andadditional mail ing offices. One-yearsubscript ionrate : U.S.A. andU.S. possessions. $13.00.Canada. $16.00. Othercountries.$20.50. (Cashordersonly. payable in U.S.A. currency.) Si ngle copies$1.25. 1981 by Gernsba ck Publi cations. Inc. All rightsreserved. PrintedinU.S.A.Subscription Service: Mail all subscri ptio n orders.changes, correspondenceand Postmaster Not icesofundefivered cop ies (Form3579) t oRadio- ElectronicsSub scri pti onService, Box 2520. Bould er, CO 80322.Ast ampedself -addressedenvelopemust accompanyall submitted manuscr ipts and/or artwork or photo-graphs if their retu rnis desi red should they be reject ed.We discl aim any responsibili ty for the loss or damage ofmanuscriptsand/or artwork or photogr aphswhil einourpossessionor ot herwise .48 SATELLITE TVANTENNAPart 3. Howtoinst all andaimthe 8-Ballspher ical TYROanten na. H.D. McCulloughTECHNOLOGY 4 VIDEO ELECTRONICSTomorrow' s newsandproductsin this quick ly changi ngindustry. DavidLachenbruch12 SATELLITEITELETEXT NEWSThelatest happe ni ngsincommunicat ionstechnology.GaryArlen94 HOBBYCORNERSeven-segment LED' s arefor more t hannumbers.Earl " Doc"Savage, K4SDS102 NEW IDEASAnRF preampfor freq uencycou nters.COMPUTERS 103 COMPUTER CORNERAnintroduct ion tocomputer applicat ions. LesSpindleVIDEO 39 POCKET TVRecent development s in flat-screendi spl ay technology willsoo nput athin portable TVinyour pocket. DannyGoodman108 SERVICE CLINICUsing sweepalignment-generators. Jack Darr110 SERVICE QUESTIONSR-E' s Service Editor solves techni cians ' problems.AUDIO 90 DYNAMICNOISEREDUCTIONHownoi se innon-e ncodedreco rdedmaterialcan bereduced. LenFeldmanRADIO 100 COMMUNICATIONSCORNERMicroprocessors...for better andworse. HerbFriedmanEQUIPMENT 26 GlobalSpecialt iesModel 4401Frequency StandardREPORTS 26 GroveEnterprisesScanner BeamAntenna28 MacrotronicsModels A4P andA8PAtari Printer Interfaces30 Archer TelephoneRecordingControl32 A.W. SperryModel EZ 6100 DMMDEPARTMENTS 14 AdvertisingandSalesOffices 20 Letters146 AdvertisingIndex 112 Market Center115 Computer Market Center 96 NewProducts14 Editorial 6 What'sNews147 Free InformationCardAsa service to readers, Radio-Electronics publis hesavail able pl ans or intormatlon rel ating tonewsworthy products, techniques andscientific and technological developments.Because of possible variances i n thequali ty and condition of materi als and workmanshipused by readers, Radio-El ectronics di sclaims anyrespon sibility for the safe andproperfunctioningof reader-built projects baseduponor frompl ans or information published In thi s magazine.3VIDEO ELECTRONICSDAVIDLACHENBRUCHCONTRIBUTINGEDITORAKA t.-.enoZocr:bUJ-lUJ6is-ccr:4VCR SALESZOOMLOOKING ATVIDEODISCSTV STEP-UPSNo matter what happens to videodiscs, home videcassette recorders nowappear tobef ir mly ent renchedas a majo r consumer electronic product.Japan 's exports of VCR'snowaregreater t hanher color TV exportsindollarvolume, andU.S. salesthisyearcouldreach1,500,000,nearlydoublethevolumeof last year . ElevenJapaneseVCRmanufact urers produced 4,400,000 VCR's last year , and it's estimated that 8,400,000 willbe made t hi s year, perhaps 12,000,000 in 1982. In the U.S., new brand names are joiningt he VCR parade-incl uding Fisher , Kenwood, Sansui, Canon and Grundig (the last witht he first NTSC version ofEurope's Video2000 format) .As the dust begins tosettle, it' s becomingincreasingly obvious that thetwodifferentvideodisc syst ems current ly on themarket-LaserVision (LV) andRCA's CapacitanceElectronic Disc (CED)-aren't directly competitive, and the question " Which will win?"maynot be appropriate. Returns aren't yet in on themoreimportant questionof whethereit her or bot h systems wi ll survive . .TheLV opt ical system, withplayerscurrently being marketed by Pioneer and Magna-vox , isanextr emelysophist icatedtec hno logical triumphwhichisat itsbest intheutili zation of special interacti vediscs, such asthe "First National Kidisc." So far ,greatest succ essesinselli ngt hissystemhavebeenachievedbyvideo dealersandtechni call y profi ci entaudioretailers. Itsbuyershavebeenlargely thoseinterestedinadvanced techn ol ogy, plus firms and institutions seeking to harness the system'ssignifi cant applications to teaching and training. Researchhas shown that a substantialmajor ity of consumers whobuy LV players already ownvideocassette recorders.The CEDsystem,on t he other hand , hasn't exactly been a dream-come-true for videodealers, manyof whom are usingit to attract customers, and thenselling them" up"toVCR' s. Whohasbeensuccessful withCED?Well, chainssuch as J.C. Penney,forexample. Andthesuccesseshave comelargelyinareas withoutcableTV, orwithoutaccesstoamultiplicity of TVchannels-andtopeoplewhodon't ownVCR's.Didyouever wonderwhatthevarious" step-up" featuresreallyaddtothecost of atelevision set? Well. apparentlysodid the International Trade Commission, whichsurveyed a cross-section of dealers. In colo r. it found that a single-knob 12-20-channelelectronic tuner increasedthewholesaleprice(thepricethedealer pays totheman-ufactu rer) $15-$20over that of amechanicallytunedset. Pushbuttontuning(12-20channels) wasa$20-$33step-up.andasingle-knob82-channel tuner cost $25-$40more than a mec hanical tuner. Random-access keypadtuning added $40-$60. Remotecont rol with12-20-channelscan(sequential)tuningcommandeda $50-$65premium,82-channe l scanningcost $60-$70andkeypadtuningbrought inanadditional $80-$100. Automat ic color circuitryincreased the wholesale price $5-$20; thecombinationof automatic color and a room-ligh t sensor cost $15-$20, and VIRadded $10-$20. In bothcolor and monoch rome, woodgrain fi ni sh cost $5-$10 more thana plaincabinet, and anAC-DCmo nochrome set cost $2-$6more thanAC-only. R-EWe gavesolderlessbreadboardinganewname. Copyright 1981 Global Specialties Corporation.CIRCLE87 ON FREE INFORMATION CARD 5o~oIIImJJ...

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uouoW0::0..Cl~ -20CluoFIG. 2-THISGRAPHSHOWShow decreasingband width affects noise reduction when theDNR is con f iguredas a single-pole (a) or double-pole (b) low-pass f ilter.How DNRworksThe Natio nal Semiconductor noise-reductionsystemcanprovideupto14dB of noise reduction in stereo program-materi al and isbasedupontwoprinci -ples . Thefirst of those states thatnoiseoutpu t isproportional tosystem band-width. Supposesystemnoiseis causedsole ly by resistive noise (noise added bythecircuit resistors). In sucha system.noise amplitudeis uniform over the fre-quencybandwidth . Thus. ifthe band-widt h of the system is reduced. the noiseAdvantages of non-complementarynoise reductionWhile companding noise-reducti onsystems are capableof reducingnoisethat is added to a program source duringthe recordingprocess itself. theycan-not eliminate noise that is already ill theprogramsource. Whe nit isnecessaryto remove or reduce noise levelsinaprogramsource, anon-complementarytypeof noise-reductionsystemispre-ferredand . since sucha systemrequiresnoencoding. completecompatibilityisret ained. Anotheradvantageof single-endednoise-reductionsystemsistheir-lowcost, compared withcompandingenc ode/ decode systems . Remember,too. that most of the programmaterialthat we listento (radio. records, TV.etc .) is not encoded at all. FewFM sta-tion s nowuse Dolby FM. despite itsearly promise. and thereforeaneffec-tive non-complementary noise-reduc-tion s system maywell be an idea whosetimehas co me.of t hoseis theDynamic Noise Filter de-veloped by Burwen. Now, NationalSemiconductorhasdeve lopedanoise-reductionsys te m, calledDNR, basedupon thesame Burwen Dynami c Nois eFilterthat does not require signal en-codi ng and, asares ult , is effective forRMbroadcastsignals, tape,and otherprogram sources. According to NationalSemiconductor, the system is particularlyuseful in automotive entertainment sys-tems and would be effective when usedwith videocassettes as well. Aninte-grated circuit , the LM1894, is avai lablein al4-pin dual-in-line, molded packageto equipment manufacturers at anex-treme ly lowprice, when bought in largequantities .BASICALLY. TH ERE ARE TWOWAYS TOreducenoisein anysound system. Thefirst of thoseis generallyreferredtoasa complementary, or companding type .In it, signal encoding takes place beforetransmissionor recording; thesignalisdecodedduringplayback . The secondtype of noise-reduction systemis re-ferred to as non-complementary, orsingle-ended; it operates during play-back only. As a result, it does not requireany special enciodingof the programmaterial.Forconsumeraudi oequipment , themost popular noise-reduction system todate has been the Dolby B system,which falls into the first (comple -mentary) category. WhileDolbyB pro-vides only 10 dBof noise reductionathighfrequencies (not enoughtomaketapehiss totallyinaudible) , it' swidelyacceptedbecauseit isa"compatible"noise-reduct ion system. That is, onecanlistentoaDolby-encodedprogramsourcewithout usingaDolbydecoderandstill findthemusicacceptable.However,thefact that Dolby B doesnot render tape hiss completely inaudiblehas promptedother designers tocomeupwith companding systems that de-liver greater amount s of noise reduc-tion. Among those are the dhx com-pandingsystem and , more recentl y, theDolby C system. Thedbx system offersover 35 dB of noise reduct ion while the(J) new Dolby C system cascades two~ DolbyBcircuits(withsomeother cir-o cui t refinements) anddelivers 20 dBofg: noisereductionin the mid andhigh fre-frl quencybands.u:J Over theyears, some designers have6 concentratedonsingle-ended. or non-~ complementary noise-reduction sys-a: temsas well. Perhap sthe best known90oo--toCDmJJ10K l KFREQUENCY-HzbIf\VI LII ~V,L)U\1\~- 40100DO'0J, - 10Cl:::>I-:J~ - 20UJ>i=:3 - 30UJex:sound-press ure levels ofasingletonearerequiredtoprovidemasking.Evenat the most effective frequencie s(between700Hzand IkHz. near thenatur al resonance of the ear). sound-pressur elevelsin excessof75 dBarerequired to mask noise at a very low 16dB SPL (Sound Pre ssure Levell. Fortu-nat ely. thoseresults apply only to puresingletone s. Withthecomplexsignalsthat areacharacteristicof musicandspeech. maskingeffect s aremuchbet-ter. The broadband spectral compo-nent s. and high concentration of energyaroundI kHzthat is produced by mostmusical instruments (Fig. 4) improvethe noise-masking ability by more than30 dB over a pur e1kHz tone . Compar-ing the frequencyspectrum of musicalinst ruments with the ear- sensitivitycurve of Fig. I, weseethat thehigh-energy content is just whereit needs tobe foreffect ivenoisemasking.o10K 1KFREQUENCY-H z~ RECHO N1\- 40100DO'0- 10 IUJCl:::>I-:J-20C>.::;:UJ>i=- 30-'UJex:FIG. 4-MOST MUSICAL INSTRUMENTSproducespectra t hat havea highconcentrationof energyaround 1 kHz. The spectrum of a French horn is shown in a; the spectrum of a violin in b.based onis thefacethat whenever wehear onesound. that sounddecreasesour ability to hear another. White noise(random noise that contains all audiblefrequencies at equal amplitude), forexample, raises the threshold of haringapure tone by alevel thatdepends onthefrequency of that tone , as shown inFig .' 3. The curve shows a generaltrend. At a higher frequency, a tonehas tobeincreased in amplitude (com-pared to a I-kHz tone) to be heard.That is because a wider rangeof noisefrequencies contribute to maskingasthe tone' s frequency incr eases. Butregardless of the tone' s frequency,therewill besomerange ofnoisefre-quencies that will be capable of maskingthat tone .The result s are not quite the samewhen wemeasure theability of a singletonetomaskunde sirednoise. Experi-mental results show that extremely highvyVi'..VDO 30'0IUJ'-'ZUJex::f 20u,Ci-'UJ>UJ-' 1010 100 1K 10K 20KFREQUENCY- HzFIG. 3-WHENNOISEIS PRESENT, thevolume(amplitude) of a tone must be Increased for It tobeheard. Howmuchthat volumemust be in-creased depends on the frequency of the tone .Auditory noise maskingThe seco nd principle that DNRiscontent is also reduced.Unfortunately. there isn't a simplecorre lation between the amplitude ofthenoise signal and the amplitude of thenoi se percei ved by the listener. Asshown in Fig. I. the ear is most sensitiveto noise inthe 600-Hz to6-kHz fre-quency range. For this reason. whenmeasuringnoise content in a system. aweighting filter is usually inserted in themeasuring instrument to give better cor-relationbetwe en the measuredsignal-to-noi se rati o and the subjecti ve im-pre ssion of noise. Whena CCIR/ARMweightingfilter (commonl yusedwhenmea suringsignal-to-noiseratios of cas-sett e tape and decks) is used. it will yieldnoise-reduction numbersof bet ween14and18 dB when the bandwidth of a sys-temisrestrictedto IkHz withsingle-pole andtwo-pole low-passfilters. asshown in the curves of Fig. 2.91filter response curv es that are obtainedby varying the control voltage from 0 to1.0. That voltage is derivedfromthecontrol pathshown in Fig. 5. Since thespectraof musicalinstruments(Fig. 4)and the ear-sensitivity curve (Fig.I) im-ply that masking is most effective atrelati vely loll' frequencies. youmightassumethatalow-pass filter would begood for the control path shown inFig. 5.That turns out not to be the case .Figure 7 shows the frequency versusamplitude response of the DNR Ie con-trol path. The DNR system uses a high-pass filter with a -3dB comer fre-quency of6kHz and -12dB/octaveroll-off slope. Anoptional notchat 19kHz is for when the source materi al con-tains a stereo-FMpilot signal that mighttend to increase minimumbandwidthabove 800 Hz whenthe detector thre sh-old is set at the noise floor.Thecontrol-path frequency-responseis weighted in that manne r becauseprogram materi al variessubstantially inharmonic content , dependingboth onrelative loudnessandontheparticul arinstrumentsbeing played. As an exam-ple. consider the case ofa French hom.Most ofthe energy producedbythatinstrument is belowI kHz. If a low-passfilter were used inthecontrolpath, itwou ld respond tothat energyand openup the filtersto full bandwidth. unmask-ing noise in the 2-kHz and above region.To avoidthat. the systemlooks forhigh-frequency energy in the musicsourceand. inthe case of the Frenchhom.notfinding any higher harmonics.thenoise remains filteredout and band-width remains restricted. Multiple in-struments. ora soloinstrument such asaviolin. forexample. may havesignifi-cant high-frequency energy that will notonly provide good noise masking butwillrequirea widersystem bandwidth.Tosummarize then. when high frequen-cies are detected in the control path. it isanindication that large levels of energyarepresent at thesametime in the criti-cal masking-frequency range. so thataudio bandwidth can be safely increasedasrequired toprevent audible degrada-tion of themusic . Thenoise. however.remains masked. To make upfor therelativel y fast decrease in spectralenergywith increasingfrequenc y. thecontrol-pathresponseis increasedat a12dB-per-octave rate .Attack and decay timesIf the detector of the DNRsystemwere allowed to respond instantaneous-ly to any input signal. ticks or noiseburstsof shortdurationbutwithrapidrisetimeswouldbeable to openup thebandwidth of thesyst em without sirnul-, taneous programmasking. Also. dif-ferent instruments have widely differingrisetime characteristics. With that inmind. the DNRsystemwas designedl OOKCONTROLSIGNAL (VelDETECTOR-50- 60L..-J..-.......... ...u..._......L...I....LJ..-.l.-..I.....J.-U100-40- 20-301-----.LEFTAUDIOOUTPUT1-_-. RIGHT AUDIOOUTPUTco"CJ, - 10 I-I-..,r-'-Xl 1.25 3Ui9CCQ 5Qpp mBand - G AP Vo lt Ref. Diode 2. 50SN7454N . 20 S N741S2N .es SN74167N ... MAN52 C.A.-green .>Xl . 99 O L121 C. C. - red .$00 1.49I211CPA Volt Ref/Indicator 2.955N14S9A .,. 5 N741Sl N."5N74361N ... MAN54 C. C_-gre en .>Xl .99 0L741 C.A.- re d .600 1.251212CPA Volt Ref/Indicator 2.955 N7460N .20 S N74154N 1.3 SN74J9QN 1.49 MAN71 C.A. -red .300 .1$OL747 C.A.-red .600 1.4914COO .39 74C 74C221I."S N7410N .29 5N741 55N."SN74393N 1.49 MAN72 C. A.-re d .>Xl . 1$01."" C. C. - re d .600 1.4974CQ:2 .39 14C95 1.59 14C240 2.25 MAN74 c.c.c-rec .>Xl 1.25 OLO&41 C. A. - o r a n ge .!OO 1.49 14C04 . 39 74CI07 1.19 74C244 2.25 74LSOO .2974 LS74L5192 1.15 MANI2 C.A.-yellow .>Xl .49 DL086Q C.C. -orange .!OO 1.4, 74Coa . 39 74CI51 2."74C373 2.49 74LS01 .29 74L5 19J 1.15 MAN&4 C.C.-yel low .>Xl .99 OLJ JB C. C. -re d .110 .3$ 74CIO .39 74CI54 3."74C174 2.59 74LS02 .29 74LS92 .1$ 74L5194 1.15MA NJ620 C.A.-or.llnge .soo .49 F N0351 C.C . 1 .l57 .9974C I4 .1$ 74C IS7 2.25 74C901 .ss 74LS03 . 29 14LS93 . 1$ 74LSl95 1.1$MAN3630 C.A.-o r.llnge! 1 .soc .99 FN03S1 .157 .1$14C2O .39 14ClGO 1.6974C!Kl3 ... 74LS04 .36 74LS9S .99 74LS197 1.19 C.C .74C30 .39 74C161 1.60 74C911 10.95 14LSOS .36 74LS96 i. is 74L5221 1.19 MANJ640 C.C.-or a n ge . >lO .99 FN0500 C.C. ( F N 0 503) .$00 .9914C42 1.3'l 74C162 1.49 7. C912 1Q.95 74LS08 . 36 74LS I07."74L5240 1.49 MA N4610 C. A. -or ange 'l er Imer 3950096 50 8 Chann el Seroal395009655 h'llel hgMt r apeCorlt roller 550 00961 03 32/32I/OModu le 2750096702 Cont act Closu reModule 35000UNPOPULATED BOARDS(AlSO A... . RETAILSTORESOPEN MON-SAT P.O. Box 17329 Irvine, Calif.92713 FOR INTERNATIONAL ORDERS::;: W.rehouMI Direct Order Lines:(714) 5588813 1310E.Eding er (714) 953.a6U4RETAIL PRICIN GMAYVARY (800) 854-8230 or (800) 854.8241 Sanl aA na.CA92705FIRSTQUALI TYATSURPLUSPRICESPECIALPURCHAS E$59.95 Li mile d Supply $59.9516K Alt ai rRAMBoards . Fully PopUlatedasis.ent.)zoII:l-t.)W...JWo15

122 CIRCLE 5 ON FREE INFORMATIONCARDoo-ioOJm:0......toco......' 00>' 00>. 00'1 00" 00" 00"00"000"' 00BuyaSystema ndSave.A\.ATARI' 800 & 400New software ... '- Ttl"E'-U"#Sl00.00 per 07. Sales Prices Validonl y 11 TOU mention p ublic a tion and month.Cred1t Cardor d wi h ar ro not frei ht .CIRCLE81 ON FREE INFORMATION CARDHIT-V35235MHz DUAL TRACEWITH DELAYUSTPRICE: $1150.00S4LEPRICECALLEconomically priceddual trace oscill oscopeSquare CRT wi t hint ernal graticul e(illuminatedsc a le) High-ac curacyvoltagea xi s & time a xis set a t;;:3% (certified at 10'to 3S'C)High -s ensi ti vit yImV/di v. Low drift 2 Year Wa rranty50 MHz & 100 MHzDUAL TRACEWITHCALIBRATED TIME DELAYHITVI050100MHzwith3rd & 4th TRACETRIGGER VIEWLIST $2390.00SALECALL30MHZDUAL TRACEHITV550B50MHzwith3rd TRACETRIGGERVIEWLIST $1745.00SALECALLHIT-V20220MHz DUAL TRACEUSTPRICE: $850 CALL Dynamic ra nge 8 di v.TV sy ncsep a rato rci rcuitBuil t-i ns ignal d el a yline (V-3S2) X.YoperationSw e ep-time magnifie r(10 times) Tra ce rotation systemFine a d ju s t i ng,cl ick-posi tion i ngfun cti onSCOPE SALEOURLOWESTPRICESOF THE YEARI

TheHITACHIVS50B (5OmHz) a ndVI050 (lOOmHz) offerall the capabilities youmight e xpect fromalab gra deosci lloscope. Capabi li ties such a s3rdtracetriggerview, abright 6" square CRT, and amax . sweep ra te of2ns/div(VI05O) 5ns/di v (VS5OB). Als o, Iea tures youmaynot expect li ke, sensit ivity of Imv/div (VSSOB).Sm/d ivVIOSO lOmHzautomatic focuscorrec tion.Sin gl e and dual trace. 15thru 100 MHz. All hig h se ns itiv ityHitachi osci lloscopesarebuilt tode mandin gHit a chiqu ality standards and a re backed by a2.year warra nty.They' re a bletomeasuresignals as low aslroV/divis ion(with XSvertical ma gn ifier). It' s a specification you won' tfi ndon a ny ot herIS or30 MHz s cope s . Plus: Z-a xi smodula tion, tra cerotation , front pa nel X-Yoperation fora ll scope models , a nd XlOswe ep magnification . And. 30thru100 MHz oscilloscopes offer in te rna l s igna ldel aylin es. For ease of oper a tion, functi onally rela tedcontrolsaregr oupedint oth reebl ock sonthecolor codedfrontpanel. Now her e's the cl incher: For what you' dexpect topay more, you a ctu all y pay less . Check our sco pes befor eyou decid e. All scopes comple te wit h probes.HITV302B List $995.00SALE $819.00 TVsync -separator ci rcuit High -sen siti vit y ImV/div(SMHz)Sweep- time magnifier(lOtim e s) Z-a xis input (inte ns itymod ulation)Signal dela y lin eCompl ete wit h 2 probes CH1. CH2, DUAL. ADD.DIFF. VerticalDefl ection Mod es X-Yopera tionOSCILLOSCOPE . Tra ce Rot ationHitachi ... The measure of quality.HITV152BDUALTRACE15MHZ(no delay)LIST $735.00 SALE $629.00130enozoII:t>w-.IWois-cII: Operates up to 10MHZ(SO ns RAMChips) Assembled & Tested Meets or exceedsall IEEE696/SlDO specifications (incl udingtiming). Fully static design eliminates thetiming problems associated with dynamicmemories.Switch selectable choice of 24address lines conforming to the IEEE696/S-lDO extended addressingspecifications. or 16address lines as usedin older SolDOsystems. Ideal for multi -userinstallations. Board is addressable as one16Kx a block on any 4Kboundary. Swi tchselectable PHANTOMdisable and wr iteprotect. + 5 Volt operation (requires noother supply voltages).Lowpoweroperation (900 rnAtypical. 1200rnAmaximum). 1year FactoryWarrantPro'" from ..............--10MHZ 16KA&TSTATIC S-100 RAMGBT-143A $169 00 EList $349.00 a. 3/ 450.00POWERLINE SPECIAL PURCHASE INSOLATOR oGOLD' 1GOF-IBARW3 JdJf\16 FINLOW! SH. WT. 3 Ibs.-(I List Price SS995e:t:llSale Price . C-35 BOOKETS1 CC WITHDATA TIG-16LPpkg.01 100 S16.PROCESSINGEQUIPMENT TIG-16LPpkg . 01 1000 S120.0OEMS Stock up at thl. LOWPRICEVCT366796" x4.5" VCT3690-12 $26.54$13.33 VCT36616.5" x4.5" CARD EXTENDERVCT3677-2 6.5" x4.5" $8.69 Card Extender has 100 conlacts$10.68 VCT-36622 9.6" x4.S" 50per sid. on.125centers-Gen. Purpose Il.l.P. Boards wilh $IUS Attached eenneeter-tscompati-BusPattern lor Solderor Wire Ppatlernplugbaards lorIC's Ex blewllh5-100 Bus Syslems.Wrap. Epoxy Giass 1/ 16" 44 pin poxy Giass 1/16" 44 pin con. YCT-3690 6.5" 22/44 piDcon. spaced .156 . spaced .156 .156ctn. Ext.nd.n . . . $15.&6PlugboardsIII/":c vcrasrr "",, , .VCT-3612 9.6" x4.5". $13.63VCT-38622 6.5" x4.5"$11.04Hi-DensiiyDual-In-Line Plug-board forWire Wrap with Power&Grd. Bus Epoxy Glass 1/ 16"44pincan.spaced .15610-24$18.26MICROCOMPUTERPRODUCTSPARTNO. PRICE 6502SERIES2016P3 8/$100,00 PARTNO. PRICE2114N3L 8/$28.00 6502 $12.955257N3L 8/$50.00 6502A 518.952732 8/5120.00 6520 $8.952716 8/$50.00 6522 510.952708 8/532.00 653G-002 $21.958080SERIES 653G-003 $21.95PARTNO. PRICE 6530-004 521.95INS 8080A $5 50 653G-005 $21.95 6532M $21.95INS 8OS5A 519.95 6551M 521.95DP8212N S2.95 6800SERIESDP8214N $5.25DP8216N 52.95 PART NO. PRICEDP8224N 53.25 MC6800P 511.95DP8224-4N $9.95 MC6802P 517.95DP8226N 53.50 MC6808P 59.95DP8228N $5.55 MC6809P 534.95, DP8238N $5.55 MC6821P $5.95INS8250N 515.00 MC6828P 514.95INS8251N 57.50 MC6840P 514.95INS8253N 517.95 MC6845P 531.00INS8255N 56.80 MC6847P 514.95INS8257N 516.45 MC6850P $5.41INS8259N 518.00 MC6852P $5.79INS8275N 559.95 MC6854P 524,95INS8279N 549.95 MC6860P 510.89Z80 SERIES MC6862P 512.00Z80A 514 95 MC6875L 57.40Z80APIO S14:95 MC66710P 512.50ZSOACTC 513. 95 MC66750P 512.50Z80ADMA 545.00 UARTSZ80AStoo $59.95 PARTNO PRICEZ80ASl't1i 559.95 AY51013A $5.95Z80ASI 02 S59.95 TRI602B $5.95FLOPPY DISC TR1863 $8.95CONTROLLER IM6402 57.95FDI77IBOI 524.95FD1791B-01 544.95from Leading Manufacturers(16RxI200)8 for $20.Add $3.00 for programming Jumpersfor TRSaOKeybaord5-9$20.37VCT8101lSame as 8800Y exceptplain, lesspower buses &heal sink.1-4 59 1024$15.67 $14.24 $12.82Universal Microcomputer/processorplugboarduse withS-100 bus.Complele with heal. sink & hardware. 53" x 10"x1/16".1-4$22.48 TRS-SO/APPLEMEMORY EXPAN.SION KITSO. l spaci ng forIC' s 4116'8 RAMSS- IOO "ANYDIP" ha slull power an dgroundpla nes lxick to back. Boardsaccommodates.3. .4. .6, .9" Dips.1-4 5-9 10-24524.67 522.34 $20.02APPLE PLUGBOARDVector 4609 Per ipheral Interfa cePlugboard for construction of customci rcuits. Plug compati ble withAppl eII, Commodore PET andSuperKimmicrocompute rs. VCT-46091-4 5-9 10-24$20.74 SI8.79 516.84PbolMllc PRICEPARTNO. SI2E 19 101!YCT-64P44X 4.5" x6.5" $1.56 $1.40YCT-169P44-X 4.7" x 17" $3.69 $3.32Eporr GlossYCT.64p44 4.5" x6.5" $1.13 $1.65YCT84P44 4.5" x8.5" $2.25 $2.03YCT I69P44 4.5" x17" $4.61 $4.15YCTU9 P48 8.5" x 17" $9.00 $8.10STAR MODEMFROMLIVERMORELIST PRICE$199.00wit h Bell 103 and 113. Answer! SALE PRICEOr igi nat e. Full /Ha lfDupl ex. Special $12900se lf test feat ures. RS232and "0" SUB-MINIATUREr.T'TorTTn-.'l'NNECTORS11 11111 P=Plug. MaleType -Se Socket. Female Type -C Cover, HoodPART NO. DESCRIPTION PRICE1 9 10-24 25-99CHD-DE9P 9 pin male $UO $1.90$1.70CND-DE9S 9pin lemale $2.70 $2.40 $2.10CND-DE9C 9pin cover $1.50 $1.25$1.10CND-DAI 5P 15 pinmale $2.75 $2.45 $2.15CND-DAI5S 15pih fernele $3.95 $3.60 $3.20CND-DAISC 15pincover $1.50 $1.30$1.10CND-DB25P 25 pin male $3.50 $3.25 $3.00CND-DB25S 25pin Iemcle $4.60 $4.35 $4.20CND-DB51212 I pc.greyhood $1.60 $1.45$1.30CND-P25H 2 pc.grey hood $1.50 $1.25 $1.10CND-DB51226 2 pc.blackhood $1.90 $1.65 $1.45CND-DC37P 37pin male $5.80 $5.10$4045CND-DC37S 37pin lemaie $8.70 $ 7.70 $6.70CND-DC37C 37pincover $ 1.80 $1.55$1.30CND-DDSOP 50pinmale $8.75 $ 7.75 $6.70CND-DD50S 50pin lemale $I 1.65 $10.25 $ 8.90CND-DD50C 50pin cover $2.00 $1.80$1.60CND-D204IB Hardware set 2pro $1.00 $ .80 $ .70RS232, DB25P, EIACND-RS2328F Cia.. I cable8can.8II. $19.95 $17.95 $15.95Cenl. 700Sen..CND-5730360 Printerconnector $9.00 $7.50$6.00'ZERO INSERTION , 19 1024 2599."., '"",,",_ -ZIPUDIP $5.50 $5.35 54.95ZIP24DIP $7.50 $7.25 $U5ZIP-400DIP $ID.25. $9.85 $9.50SEND $10for 60PageCATALOG1M-IDALi.t 5104.95SPECIAL569.95 with tubePed ectl ybalanced fluores-ce nt lighting wit h precisionmagnifi er lens . Toughthermoplasti c shade . Eas ylens removal. New wire clipdesi gnpermits "!Osyinstol -lation and removal offlouresc ent tube. Come sLEBUwit h plastic shield to pro-tect tubefromsoil ing a nddamage.Colors : Gray, Black, andCh ocolate Brown . Comeswith one 22wall T-9Circlin efluorescen t tube, 3dio pterlens. 10 lbs.oIJlmJJCIRCLE81 ON FREE INFORMATION CARD 13153. Vacu um Viceo Auto-Indexingo Anti -Overwrapo ModifiedWrapPart No. Description P,BW2630 Tool 519BT30 #30 Bit (not incl.) 3BT2628 #28 Bit (not incl.) 7BC1 Batteries& Charger 14VV1INSERTIONI EXTRACTIOTOOLSVACUUMVISEPart No. Description PINS1416 14-16 pinInsert er 5,MOS141614-16 pi nMOS SafeInserterMOS242824-28 pi nMOS SafeInsert erMOS40 40 pinMOS SafeInserterEX1 14-16 pinICExtractorEX2 24-40 pinICExtractor-,,---,",WK7 ICINSERTIOIComp leteIC Iserterl Extrac :Individual COlponents(Iisteabove) 522ICDISPENSERAllowsIC'stobe dis -pensedfromtheir tube1at a t imeandpickedupbyi nsert ion too lsabove.o Dispenses 8-42 pinIC's0 Compatablewithall Iecarryingtubes 0Use withWK7for MOSsafeinserti on. 0Part No. DescriptionMDD1 1 Chan. Dispenser 5 ~MDD5 5 Chan. Dispenser fMDD10 10 Chan. Dispenser 1(' NoDiscount.Uniquevacuum-basedlight dutyviseforprecisionhandli ng ofsmall componentsandassemblies. RuggedABS construction. 1%" (32mm)travel for maximumversat i lity. Alsofeaturesscrew lugs for permanentinstallat ion.Price51.692.593.493/1.79$48.95Description4-Pole8-Pole12-Pole2-Pole InterlockingPSL1P.C.B.TERMINALSTRIPSThe TS stripsprovidepositivescrewactivatedclampingaction, accom-modate wiresizes14-30 AWG(1,8-0,25mm). Pinsaresolder platedcopper,.042 inch (1mm)diameter,on.200 inch(5mm)centers.Part No.Compatiblewithall logicfamiliesus-inga 4 t o15V power supply.Thresho ldsautomaticallyprogramm-ed. Visual indication of logiclevels toshowhigh, low, badlevel or open cir-cuit logicpulses.010 N sec. pulseresponses0120 K i nput impedence.-Autornatt cresettingmemory.-Inctudes tip withprote ctivecap&coiledcord.PRB1 $36.95LOGICPULSERSuperimposes a pulsetrain(20 pps)ora singlepulse ontothecircuit nodeunder testwithout un-solderingIC's.o Aut omati cpol aritysensingo 2 uspulsewidtho Finger tip pushbuttonactuatedo Includes t i p withprotective cap&coi ledcord .PRODUCTSTS 4TS 8TS-12TS6MDLOGICPROBEDESOLDERING--..... - PUMPEasyone handoperation.Ruggedall metalconstrue tio n.Replaceab leTEFLON"' Tip. Sel fcleaningoneachstroke.Sucti onpreciselyregulated for rel iabledesolder i ng withoutdamage todelicateci rcuit ry.DSPI Desoldering Pump 59.952.49Price54.982.984.981.98. Price56.957.95Sl ippedontosocketbeforewrapp ingtoidentifypins .TERMINALSo .025(0,63mm)SquarePosto 3 LevelWire -Wrappingo Gol dPlated25PER PKG.DescriptionRegularModifiedJust Wraptool fordaisy chai n wiri ng.Tool st ripsasitwrapsand cuts.Includes one50 footspool of wire .......Part No.WSU30WSU30MINS 1Bulk BulkPart /I Price Price Part /I Price1410 1.49/10 5.501100 22101610 1.49/10 5.95/100 24101810 1.49110 5.00150 28102010 1.49/5 5.00150 4010i- lRegul ar ModifiedWrap Wrap._lHAND WRAP TOOL; ~ ~ : ~ 18 19 202\ 222> 2\lr_I'-ID"l""~ " ~ 9 e 765, ) 2 t SOCKETWRAP- IDDescription PriceJW-1' Just Wrap Tool 514.95JWK-6 Tool w/4 SpoolsandJUW1 24.95R-JW' 50 Ft. ReplacementWire 3.49JUW-1 Unwrapping Tool 3.49'Specify Color: Red, Blue, Whit e orYellow.A llii'1f l!IIiI FJ'1Ii1\\=3>......Part No. DescriptionWWT-1 Slotted Termi nalWWT-2 Sing le SidedTerminalWWT-3 IC Socket Term.WWT-4 Double SidedTerminalInsertion Tool foraboveColor Coded10II. 100II .4.00 30.005.00 42.005.60 48.007.00 60.008.00 72.008.60 78.0011.00 102.0013.00 120.0016.00 150.00Solid Color10II . 100II.2.90 17.003.40 23.803.70 27.204.40 34.005.00 40.805.40 44.206.80 57.807.80 68.009.50 85.00RIBBONCABLESize101416202426344050DISCOUNT SCHEDULEAmount Discount and the name ofNet thismagazinemust bemen-less10% tionedat time of order togetless15% discount. Discount appliesless20% onall items except as noted ,less25% " NoDiscount."$3.954.355.006.056.907.50Order$15- 99100 - 199200 - 499500 9991000 upIDE10BIDE20BIDE26BIDE34BIDE40BIDESOBIDCCONNECTORS.1"Spacing. Crimps onto cab lewithordi nary vise & mat eswit h standard.062" CardEdge.102026344050EDGE CARD CONNECTORSSize Part No. PriceORDERINGINFORMATIONepaid orders over $50 shipped prepaid via)S. All othersadd $3.00for handl ing. VISA,:::; , COD's and open account orders will bearged freight. $15 minimum order. $100nimumopenaccount order.CABLE PLUGS5 PIN"D"CONNECTORSSOCKETS,lderStyle Part No. PriceSize Part No. PriceSize Part No. Priceale DB2SP $2.95 14 IDP14B $1.45srnal e DB2SS 3.95 16 IDP16B 1.65 10 IDS10B $1.88) ver DB2SC 1.50 24 IDP24B 2.50 20 IDS20B 2.7540 IDP40B 4.15 26 IDS26B 3.50Ie Style34 IDS34B 4.50al e IDB2SP 6.25.1"Spacing. Crimpsonto cablewith 40 IDS40B 5.40srnale IDB2SS 6.60ordinary vis e& pl ugsinto standardIC SO IDS50B 6.50over IDB2SC 1.60Socket.) Ider Sty leso ldersontocable,IDC.1"Spaci ng. Crimps ontocab lewithyle cri mpsontocablewithvi se. 9,ordinaryvise&mount s toheadersol di, 37 and50pinavailablealso.WIR'E WRAPSUPPLIESabove,liRE WRAP WIREWIREKITS#30WireWrap WireKit No.1 $9.95,ngth lOOIBag 500IBag lKJBag250 3" 100 4V,'5" $1.38 $3.94 $6.81200 3V,' 100 S"0" 1.43 4.25 7.46100 4" 100 6"5" 1.51 4.57 8.11D" 1.56 4.88 8.73 Kit No.2- $24.955" 1.63 5.21 9.39 250 2V,' 250 5") "1.69 5.54 10.04500 3" 100 5V,'; " 1.74 5.92 10.69Size Part No. Each Tube500 3V,' 100 6") "1.82 6.23 11.34 500 4" 100 6V,'," 2.11 7.08 12.9908 ICN083WBSG .44 52x .39= $20.28250 4V,' 100 7"14 ICN143WBSG .53 30x.46= $13.80) "2.19 7.44 13.6816 ICN163WBSG .58 26x ,50= $13.00Kit No.3- $34.95j "2.29 7.78 14.40 18 ICN183WBSG .78 23x.68= $15.64) "2.35 8.12 15.10 20 ICN203WBSG 1.00 21x.85= $17.85250 2V,' 500 4V,'5" 2.40 8.46 15.8022 ICN224WBSG 1.07 19x.92= $17.48 500 3" 500 5"24 ICN246WBSG 1.09 17x1.09= $15.98 500 3%" 500 5V,')"2.46 8.92 16.5128 ICN286WBSG 1.43 15x1.23= $18.45500 4" 500 6"5" 2.53 9.15 17.2240 ICN406WBSG 1.85 10x1.60= $16.00.0" 2.63 9.58 17.91Kit No.4- $59.95I lengthsareoverall , including1" strip Selective Plating provides gold in contactSOO 2W ' 1000 4V211Ieachend. Choosefromcolors; Red,where it counts. 3-level wrap. Save by buy-1000 3" 1000 5"ing sockets by the tube. All gold available atue, Bla ck, Yellow, White, Green,Yz /pin extra charge. 1000 3V, ' 1000 SV, 'ange,andViolet.1000 4" 1000 6" No Discount:IGHT ANGLEHEADERSSOLDER TAIL WIREWRAPze Part No. Price Part No. PriceIDH10SRB$1.20 IDH10WRB $2.60IDH20SRB 1.90 IDH20WRB 4.15IDH26SRB 2.75 IDH26WRB 5.35IDH34SRB 3.75 IDH34WRB 6.25IDH40SRB 3.75 IDH40WRB 7.35IDH50SRB 4.75 IDH50WRB 9.20, Spacing. Mounts on PC Board & Matesth IDS Socket below. Ejector Bars - 4/1.00.P.O.BOX401244RGARLAND, lX.75040(214) 278-3553Sound Effects Kit $18.S0The Greatest BreakthrouchIn Electronic Music Ever!TheSuper MusicMakerREVISION 2SZ4.9S(Basic Kit)DOftS not mclude spukftrSWItches or 2708 ROM.Now youcan pl ay hundreds of songs usi ng t he Bulle t SuperMusic Maker. The uni t features a single l act oryprogrammedmi cropr ocesso r Iethat come swi th20pre-prog rammedshort tune s. By adding the additional PROMS(2708's) the systemcanbeexpandedtopl ayupto1000not es per PROM. Just think .. . acompact elect ronicinstrument t hat will play dozens. hundr eds or event housandsof select ionsof music .Thekit comeswi t hailel ectronic components (l ess the PROM) , and adril led.plated andscreenedPCBoardwhichmeasure s 4" x4ta".The7 watt ampli fiersectioni s onthe samePC boardanddri ves an8 ohmspeaker (not incl uded ), from a whisper toearspl i ttingvolume. Si nce t he unit work s on12 VDe or12VAC., vehicleor port ableooerat i oni spossible. What doyouget for $24.951Everyt hi ngbut a lpeahr, tranlformer,case, swit ches, and PROM. Addit ional 2708 albumscontainingpopul ar tunes areavail ablefor$15.00 eachoryou can progra myour own PROMS using Intc rrnatlcnprovidedwiththekit instruct ion s. Li sts of availablePROMalbum s are avail abl e on request. (Not e: Unit pl ayselectron i c mus i c one not e at a ti me, It is not possible to playchords or a mel odywithharmony simu ltane ousl y.)*Envelopecontrol gi vesdecaytonotes.*" Next tun e" feat ureailows sequent ial playi ng of all songs.*On boar dinvert erallows single voltage (+12) ope rat ion.ACCESSORIESDIPSwltche. One e pos.,One 5 pos . 2.oo/Set(Canbedirect lyso lde redtoPCBd. toaccesstunes)RotarySwltche. Two 5 position 2.50/Set(For remot e wiringtoPCBd. to accesstunes)Attractive Pla.tlc ca. e 8.50Wall plu gTran.former 3.00(For operat ionon117VAChou se voltage)FEAT URES: AM. FM SI.,.o.Ptlo,.., Inpu t. AUK ' npu l. ACCord, 300 Ohm AnlennaInputAMLoops tlck Anl anna .St.ndard Turn tabl aPlugs.BUY3SETS(Tun er Amp combo .) l or$50.00Pro te ct yo ur ex pensiv e equi pment fr om ov er volt ageconditio ns. Everycomput er shoul dhave one! Wort. withanyfuted De powersour cef rom10 to20volt s upto25 amps.Overvoltage Protection Kit $6.957 Watt Audio Amp Kit $5.95SMAll. SINGLEHYBR IDICAND COMPON ENTS nrONA2"x 3" PCBOARD(INCLUDED) RUNS ON12VOCGREATf OR ANYPROJECTTHATNEEDS AN INE XPENSIVE AMP LESS THAN 3' THO @I 5 WATTSCOMPATIBLE WI THSE01 SOUNDKITStereo AMP/Power Supply BoardTakes l owl evel audi oanddrives 8 ohmspeakersON-BOARDRectifi er s andFilter supplypowertor AMPANDTUNER. VOLUME, BALANCE.and TONE SLIDE CONTROLS... NOC.O.D: ... SENDCHECKM.O. ORCHARGECAR DNO.... PHONEORDERSACCEPTEDONVISAANDMASTERCHARG EONLY... ADD5.. FORSHIPPING TX.RES. ADD5i1l1l STATESALESTAX... ALLFOREIGNORDERS ADO 3O'7tFORSHI PPINGCHA RGES. U. S. FUND S ONL Y,(214)278-3553Doomsday Alarm Kit S9.95II you have trouble sleepingandyou wou ld lik e the rest 01t henei ghborhood tosha re yo ur mi serythent hi s li tt le kitwill be for yo u! There i s no way to accurately descri be t heun earth ly howls. screams andtone s that come out of t hiskit. Four separatetoneoscill at orsaremi xed, cancelledandstepped at a varying rat e. 10 Wattsof cr azy soun ds. Agreatfunkit ora pract ical burg laralar m. Co mplete wit hPC board and al l necessary componentsless speaker. For6-1 2 VDC.ORDERDA- 02.$12. 95W/Sasie SpecSheet (4pages)60pagemanual with 5-100 interfaceinst ructionsandseveral pr og rammingexamples, $3.00ex traMANYOTHERCOMPONENTS AND KITS AVAILABLEIN OURCDMPLETE CATALOG . CALL OR WRITEFORFREECATALOG.AY3-8910PROGRAMMABLESDUNDGENERATDRTh e AY3-8 910 i s a 40 pi n LSI chip wit h thr ee oscil lator s, t hreeampl itud e cont rols, programmabl e noise generat or. t hreemixer s. an envel opegenerator, andthree D/ A converters t hatareco ntroll edby8BIT WORDS. Noextern al potsorcapsrequ ired . This chip hooked toan 8 bit mi cropr ocessor chi p orBuss (8080. Ze D. 6800etc.) can besof tware contr oll ed toproducealmost any sound. It will play three note chords. makeban gs, whi stl es, si rens. gun shot s, explosions. bleet s. whines,or grunts. In addi ti on, it haspr ovision stocont rol it sownmemorychi ps with two 10port s.The chiprequires+5V@75ma anda standardTTLclock osci llato r.A truly inc rediblecircuit.TheSE-Ol lsacompl etekll ttlatcontain s allihe pansto build"pr og rammable sound ettecuff gener ator Dn lgned aroundthe new Tex.. InstrumentsSN76477 SO\Ind Ch ip. theboa rdprovldMban ks01 MI NIDIP SWitches and pot , 10progr am t he vancus com-binat ions ct ene SLF OSCIllator.veo. NOise. One Shol , andEnvelope Co ntrol s A QuadOpAmp ICIS used toImp leme ntan Adjust able Pulse Genera-tor . Level Comparator andMuillplex Oscillator lor evenmo revers at ility. The3i4Mx5MPC Board l eatur " a protot ypearea to allowfor user addedcucuury. EaSily programm edto d u plica te Expl o ll on l ,Phuor Gunl, Steam Trail'l l , oralmost an Infinite num ber ofot her lOunds . Th eUni t ha, amu lt i ple of app hcatlo ns Thelow price Incl udes eu part s,assembl y ,manual. programming cha rts . and. det ai l ed 76477 chIpspeClfl callons It run s on a9Vbattery (not Inc l uded) . Onboard100MWampwill drive asma ll speaker di rectl y. or theumt can beco nnect ed to you r st ereo WIth mcrecrbre results! ISpeaker no tin c l uded ) . 761.77II Included. Avail abl eseparat el yfor $3.15eac h .Anewgene ratio nofminiaturecomputersONLY$29ONLY4K$110ACOMPLETECOMPUTERMICROACE/SINCLAIRVIDEOUPGRADEKITMICROACE/SINCLAIR16KRAMPLUSEXPANSIONBOARD SLOTS WITHEXTRAPOWERSUPPLY16KONLY$1498KFLOATINGPOINTSUPERROMPACKWITHNEWMAN UAL ONLY $35Onl yruns wit hNEWRDM(Smoothscreendisplay)OK' MICROACEILO SINCLAIRUSERSPDSTAGE$20power su pply$50.0024PIN $0.2540PIN $0.30UHFModul ators $9.90COMPPROMIXERProfessionalaudio mixerI that youcanI build yourselfand saveover $200.Only $199l orcompletekit .CIRCLE 43ONFREEINFORMATIONCARDACCESSIT AUDIOADD-ONSPrice on applicationInt erf ace Cardsfo r Apple.Pet . TRSSO.andPMC -RS232Interf aceCards notnecessaryfo r parallel.Full TRSSOTTL SALE74LSOO $0.15 74LS74 $0.45 74LS365 $0.7575LS04 $0.15 74LS86 $0.55 74LS373 $2.2074LSOS $0.20 74LS93 $0.90 ZOOA $5.5074LS10 $0.29 74LS157 $1.20 ZOO $4.2074LS32 $0.35 74LSl65 $1.75 REG. 7805 $0.90SOCKETS LOWPROFILE14 PIN $0.10 18 PIN$0.1516 PIN $0.10 20 PIN$0.1510VPowerAdapte r6OOml. $6.90GETYOURSELFANEWEPSONMX80 &MX70PRINTERANDSAVEA FORTUNE .-.. ..WITHNEWEXTRAKEYS!Pl easemakechecksandm on ey o rders payabletoMicroAceo r phoneyourorder quoti ng. .DinersClubo r AmericanExpress number f or i m mediate d espatch. A dd6%Taxfor Shi pment si nsideCalifornia.MicroAce, 1348 East Edinger, SantaAna, California, Zip Code92705. Telephone: (714) 5472526SHARPPC1211$190TVGA MEBREAKOUT KITPMCPERSONALCOMPUTERCOMPUTERl POWERTHAT\ ONCE FILLED AROOMCANNOW BE CARRIED INYOUR POCKET! Programsin BASIC " QWERTY" AlphabeticKeyboard.1.9KRandomAccessMemory LongBattery Life.lMicroAciJ J:t.Has got tobeoneof the world 's "4 .....greatest TV. games. Yo ureall Y. get ..hooked . Has also 4 ot her pinballgamesand 101 5 of opt i onsGood kit for up-gr adin g oldamuse me nt games.MINI k iT PCB . sound&visionmodulator. memorychi panddecodec hip , Ve ry simpletoconstr uct. $30.00OR PCB$6.00 MAI NLSI . 17. 00ONLY$575 t 6K user RAM. plus extended12KMicrosoftPOSTAGE. in ROM. Full y TRSSOLevel II$20 software compat ibl e. Hugerange .of softwarealready ava ilable . Self contained, PSU ,UH F modulator. and cassett e Simply plugs i nt o vi deomonitor or UHFTV Full expansi on t odis ks and printer Absolut elycompl et e- iust fit in t omainsplug.C/)2zoex:f-____iiiiii__"" ....JwIoCi ......_-..;.-------..;.----------------------- 134Phone:(305) 887-8228TWX: 810-848-6085We accept MasterCard and Visa.SURPLUSELECTRONICSCORP.7294 N.W. 54th StreetMiami , Florida 33166 WHOLESALE/RETAILEQUIPMENT/COMPONENTS/WIRE & CABLE/ACCESSORIESCOMPUTER GRADE ELECTROLYTICS"TANK BATTLE" TV GAMEInjustashort timeand wnhafewminor parts. themostnovice hobbiest cancompletethisexcningTank Battlegame.Createafun-filledeveningfor thewhole family.Two independent tanksrumblethrulandmine fields.shoot shells andfragment whenM. Fourdistinct enginesoundsareproduced torthedifferent speeds. Soundsofgunfire. shell burstsandtankexplosionsare realistic.Automaticon-screen scoring. Suppliedwithschematicdrawing.SOLDASIS$9.95 ea.50-99 $6. 00l 00-up$5.50C.B. SPECIALCONVERT THESE TO 10METERFMNew printedcircunboardassembly. (Squelchpot.volume control andchannel switch notinduded.) Boardssold asis.thewayweboughtthem from themanufacturer. Boarddimensions6'x6l> 71-9$7 . 5010-49$6. 50VOLTS DIAM./LGTH. PRICE@ 1SV 3" x S1/2" $4.00ea.@ 20V 11/2" X S4" $3.00ea.@ 2SV 1%" x 2%" $2.00ea.@ 2SV 1W' x 2" $2.00ea.@ 2SV 1W' x 4W' $2.00ea.@ 30V 3" XSVz" $6.00ea.@ 30V 1" x S4" $4.00ea.@ SOV 3" x SYz" $3.00ea.@ 7SV 1W' x2W' $2.00ea.@100V 1Yz" x3W' $2.00ea.@300V 1%" x3W' $2.00ea.@4S0V 1W' x 2" $2.00ea.VALUE/MFD63,00010,0002,7002,9003,000100,00039,00034,8004S0SOO240SOEdgeMeter 250UA,fits inhole.81ackbackground.Scale 1-20 Top.0-5Bottom.$1.25 ea. 5/$5.00E. F .JOHNSON SMETERTRIMMERCAP

1.5-20pF (ARCOPC-402)50Cea.PANEL METERS25-0-25VDC. 2W' x 3"0-25VDC. 2W' x 2W'0-50VAC. 2W' x 2W'(Shunt requi red)$4.00 ea. 2/$7.00DIPSWITCH

7 POSITION $1.30 ea.8 POSITION$1.50 ea.12 POSITION $2.110 ea.COPPERCLAD BOARD(Doubl e Side)Size 9.25x10.75Thickness .062$2.00 ea.oo-IoCDm:IIMolded 3 ProngPlugwith moldedreceptacle8elden 16AWG$3.00ea.MFG8y Rotron Inc.3 Blades4." SquareUSED110 VAC $5.95 ea.NEW230VACModel MU3Al$12.00 ea.NEWSPRITE FANMfg. byRotron Inc.,Model SU2A5.115vAC. 19amps.(Impedance protected .)3V, "x 3V, ' x $12. 00 ea.7'POWER CORD

MAHOGANYPROJECT BOXMAGNETICCHESS BOARD

Foldsinhalf to carry men11" wx11"1xl ' h .$4. 00 ea.ICSOCKETSGOLDPLATEDWIRE WRAP9 VOLT NICd MUFFIN FANSRECHARGEABLEBATTERY NEW. Replacesthepopular9VTransistor Battery.$4.75 ea.4W' wx I tolY2" hHas alip for recessed faceplateandafelt bottomLength15'17'AXIAL LEADELECTROLYTICCAPACITORS2 uF@15VI21$1.0010 uF@15VI21$1.0020uF@15V12/ $1.0050uF@15V12/ $1.002.2 uF@25V121$1. 003.3 uF@25V121$1. 001 uF@35V121$1.002 uF@150V121$1 .0025uF@25V151$2. 003 uF@50V151$2.005 uF@50V151$2.0010 uF@50V151$2.00250 uF@25V101$2.00100uF@50V10/$2.0051> uF@75V10/$2.00200UA, 2Y2"x 2W'Sq.Scale: 1-30 dbtop(orange) ,0-50bottom (black)E.F. JOHNSONSIGNAL STRENGTHMETER

" ... \' ' , .. - I J 11I... ...n. $4.95 ea.I-----,.,--::-::-::,...,...,-,::-::-----lD. P. CABLEASSEMBLIES Conn& 22AWGHood #Cond25P - 1- 4-25S 1014pin 40cea.16pin 45cea.2. pin 75c ea. I1------....,.-,-----140pin$1.75 ea.J-60$25.00ea.Weather &water-proof(canbeusedunderwater).mfg. byUniversity Sound.16OHM.25Walt.350-10.000HZ.6' diam. x5' deep.Model ", MM-2C & K SWITCHESMovement7101 SPOT7103 SPDT(center off)7108 SPDT(momentary)J-3 7201 DPDT (speciallargerocker)$1.00ea. 6/$5.00L-3L-3Part #J-60J-60SPEAKERSUBMINI10K POT5/$1.00ASTATIC TUG8-D1 04MICROPHONEPre-ampdesk-topmicrophonewnhcrystalelement3-pin plug.$35.00ea.

. withOn-Otf... W' hole mount,Va" Dshaft,," threadsection.AMP METERS$2.00ea.SPEAKER2Wsquare, no shunt required.Easy toreaddial.Movement: 0-6. 0-10. 0-17$2.50 ea.3" Diam..80HM,5 Wdtts.TERMS: All malerial guaranteedunlessotherwisestated. If youarenot satisfiedwith our product. it may be returnedwnhin10days for a refund(lessshipping). Pleaseadd$4.00for shippingand handlingon all orders. COD's acceptedtor orderstotaling $50 or more. All orders shipped UPSunlessotherwisespecified. Rorida residentspleaseadd4% salestax. Minimumorder. $15.00. Foreignorders- USfunds only, add20% for shippingandhandling.COAX CONNECTORSUG-273/ UBNC-F/ UHF-M $2.50UG-255/UBNC-M/UHF-F $3.00UG-1 46Al UN-M/UHF-F $4.50UG-83B/UN-F/ UHF-M $4.50UG-175RG-58Adapt $ .20UG-176RG-59 Adapt $ .20UG-l094BNC-F/Panel $1.00S023950cPL25960CCOAXIAL CABLE50 OHM-RG174$4.95/100'$3.00/50'75OHM-RG 621U$12.00/100/....t" ....'" I.....CIRCLE26 ON FREE INFORMATIONCARDH.J.Knapp of Florida Inc.4750 96th St. N. St. Petersbur ,Florida 33708KNAPPELECTRONICPARTSSENDFORFREECATALOGVoltageRegulator Dip Switch Mini SolidStateideal for batt ery charging5 posit . Buzzer 13.7 v.6. . . . . @ 12v.TO-:;rf3AMP 51.09 Low. .98Circu it Breakers .Dip Sockets Magnacraftautoreset:::: Dip Relays< sealedgl ass or 40 pin 501/4/10 / 20AMP10/53.5042SPST NO 5.6.12. 24v.15/30pin AMPedgecon n. SPOT.36/ 72 pi n doubleOPOT .edge gold S.T. 52.25 OPOT . .on ly 5. 12v. , 40/ 80 pin wi nchester Ideal forTTL orCMOSgo ld w/ w 52.95 51. 9 9 or 10/514.95Or Call Us At (813) 392-0406Reed Relay Capacitor 6v. SPST 11: 5200.4mf92:.COTOmini CR 4003-6 .79 Lt 'l" .231. VTl -SW Va racto rUF'H lun er . rnodl!1 UES A55F$34952 CB 1 SW Pronted Circul i board . prl!dINNO) OlIWOoliJOClI,__,Knt f'M_ .., .... ' .."D __ ..... .... ..l,' tilt) .", IC"'" . 'J ..... Oft .. 0 lin. 1111'" "" .... .. eIt , "0 IIIU".,.. , to Ol ..11 11< "'. WE) tl ltt .... .. 1 ,," tl " lIC"Kf . " tI . Ut) IIffl . " ", " " f( ,\ f"ttt:I" fl.ll . ,t o .. ,tt .... .. . ,I ') Itll..* MK III leO .. 1ft "te" , KtI .. " t 11 (1on N t) _ ....e'" 'OJ ., ,,M K&. ,,1tel 'l: l) tt l " .. 1e .. 1 Itt) MOl"H' . ,'M ' un '11KtIl,t .. , t) t.. ",t,O(" , KO "IN ""see . 0) ...... MOl tt l lIt) NUl ."It l t,,, "1:".H, .. u.. ! "0 .. \.lit ""'" II') . 1';'" :St'f' t"pHH AOOIHMC .....OlI.DCt I .'OC, HIU l llm. .. :: ;:;: ..--- ......,.., .... ....,--..... .'-Pul n. ,."",,-, .......... .....,.,.,. ._. I.... -u-l ......1N04I_ . ....l ts. .. 11..uw.. I 0 1M,04=I 55 n, 55H _ :::=:0, =.,'-.:..- .- ,--... -_... --._.....-,----"'2' 5' fG8A)'!En ' =51" ' 0Il1tt ' Ltg: *""OClllllOlOCI ct.=: mtt ' I'tt ' ee1: : If"I a,.11l '5!11:i- lliU jO l' ' I E 0011 OGOIoo, I OjrOOV oct0011 ou'iiW"""""1O'Mil U0111 n:. 11 uM i l "., .......,N' II I.... ..... -If,gl- ....,;;.; .ff:it.1"1 I " Uti rn I I H I It ill- ... " "" ., ffi =tu ' "" W I DOliI::' :: : ' ::: : :.::-.:UHl ll it _ ""_:: :: :-E..L.".-'." ".,, _." .... -.. .. ..,. . S6"'" ... _ _-:::::.011 m1:?;;" 1I}t IMiN KlU unan !1:1 I tt; Sf U"'1U". In I n u 'nffg-r r:t-: :'"'1 ot 'l UII:r

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telUtm:: f :! :11:fl HilHIK" Ut Uua! i a' I I" 11iiiii"..." nl . n 1' "ltll Sl:1 n::: mn" II)-!0111'1')n6ls ra:wCOobo,....ex)0),....CIRCLE23 ON FREE INFORMATION CARDShipping extra onall merchandiseMeshna Inc.,PO Box 62, E. Lynn, Mass. 01904. IICAT ALOGNo . 20n owreadyonallmail4K X16 MEMORYboard with64IC chi ps (210 1) insocket s. Compl et e boardwi t h dat a. Super deal 50.004116-4 MEMORY16K $2 each or 8 fo r . . . 14.00MK 8164MEMORY64KDyn amicRam 25.00MPI 8i nch single side disc dr ive (OK, used) 175. 00MPI 8inchdual sided disc drive (OK,used) 350.00SHUGART 8 i nch dr ive 850FDD(ok. used) 425.00MOTOROLAMONITOR9inch115volt 60.00MOTOROLA MONITOR12 i nch115 volt 85.00Above 2 units accept comp osite video, no case, used.2 uni t s below acceptTT L. Hi volt supplyonly. Used.BA LLBROS. 12 inchmonitor 50.00BALLBROS. 5 inch monitor . cased, used. 60.00DATASTATION CONSOLEw/keyboard& 9 inchmonitor,power supply . Logic boards brokensendf ordet ai Is on t his one. $ 80.00I R SCOPE see in the dark,new, portable. 260 .00I R SCOPE KITpre-assembl ed, modul ar 150.0012 VOLTGEL CELL2%AH $14.00 5 AH 17.0012 inch CRTbonded f ace plat e, new, wit h specs .Made for computer wor k. $25 each 5 f or $100.00UNDERWATERHYDROPHONE200KC 10.00WALKYTALKieSGovtsurplus used\.condition. 4755.4mcrange. Withschemati cs. Govt AN/PRC6525each 2for 545.Ant. 55eachASCII KEYBOARDparallel S50REDLED's. 10f orS1.00MINORDER510.00USEZIPCODEForfasterserviceCIRCLE 75 ON FREE INFORMATION CARD"JAVANCO"YourPartsSupermarket150SecondAve., SouthNashville, TN 37201615-242-7575Power SupplyKit 120VAC input9to15 Vregul atedcont rolledoutp ut All parts&step by ste p inst. plusschemati c includesPCboard. tr ansformer Andall partsneededfo rmakin g(Less Cabinet&Lin e Cord)Approx. 2.5 AMP rati ng th rurangecontinuous duty order il' JCO-l ONLY $12.00OrderiI' TR- 54Xfo rmer120 VACprimary 6. 12. 24 VAC Sec. 2.75 A EA. 6.25OrderiI' LED -1 Readout6 DIG 7 Seg. 7/ 10" Characters Pinout Fum. EA. 2.75Order iI' IC-25DriversforLED-l USES 3 DriversSCL-4433abe (3) for 1.20Orde r iI' ECK-48(48) Electrol yt ics(UnmarkedandMark edGoodUsables) kit 1.40iI'TRA33-K3(3) NPN 75 watt 10 ampTO-220 Case RCA andSGS (3) PCS 1.25il' TRA 8-K12 (12)NPNTransistorFormedLeads (Good GenPurp.) (12)PCS 1.00iI'TRA- l 05K4(4)PNP Asst. TO-3 Case Transistor s(SomeUnmarked) (4) T0 31.70Remember: JAVANWarranty: (All Partssoldtoyoutobegood or full credit)ICS9-K4 40Pin .LowProfile IC Sockets (4) 40 PIN Sockets 1.0028PinLowProfileIC Sockets (5) 28 PIN Sockets 1.00Awordfor thought (have youever lookedat retail prices closely???)Theyusually end in.95e .ssc .98e .77e .88e (Buyat Wholesale)WWC- l Wire WoundChoke(100Micro henry @1000 Hertz and.010) EA. 43eCTR-31 ContactorReversingMagnet ic110 VAC Coil Approx.18 amprateonContactsFurnas iI'44NA30AF EA. 16.00PCB-SingleSidePC Board7V," x 24" (Tuff Stuff ) 6#6Holes EA. si de 2.25TL-34Piece Screwdriver Set inHandl e (A Must for!Mom!) EA. .45MC-85K6.22MFDCapaci tor @ 50VDC (6) .22 @ 50 VDC 6 fo r 1.00LA5-7K GE 455Bayo net BaseLamp (Built inFlasher) 7 GE 455 1.00EC-162K5500MFD. @15 Volt sAxial LeadLyli c. (7)PC'S 500@ 15 V 1.00FP-516800MFD. 50VoltsNichic onFP Can Electrolyt i c EA. 1.00MC-253.47MFD @ 50 V TRW Axial LeadCapac wlSliponLugs EA. .t7 eSW-12K5LeafSwi tchesSi ngl e SetContact Point s (5)Leafs .85ePleaseRemember: Wehaveoneof thelargest stock of partsin theUSA.If youshoulduseor knowsomeone whowisheslarge quant it ies call or writ e.Westockveryl arge quanti ties -but somet irrresitems areli mited.Wewill neverintentionallymis-represent anitem(We Want RepeatOrders)SPK-64Speaker 2x3inches50 ohmGoodIntercom ohmage EA. 1.75RY-55 Cot o-co il Rel ay VerySmallEncapsul atedDPST EA. .zseTC-22 Tantal umCapac. DIP .33MFD @ 35 V PC Leads EA. 12eTC-31 TantalumCapac . DIP 10 MFD. 20 V PCLeads EA. 22eTC-32 Tant alumCapac. DIP 3.3MFD. 25 V EA..24eSW-20Mom ent aryPushButt onSwit ch(Large) Pinball Flipper EA..25ePR-161PowerResistor 20 OHM22 watt Squareohm Type EA. .40eFP-54CanElect ro lyti cOuad20MFD@450 Volts(Many Comb inations) EA. 1.50WRC-950ConductorRibbon Cable(9 Feet Long) Connec torEA. End EA.2.85CH-3CardHolder (Sock et)Si ngleSi de EA. .22eEC-19K6Elect rol yti c25 MFD15V Non-Pol Axial Capacito r (6) for1.00CP-98Capaci tor .1@ 2000V ScrewEnds (Extended Foil) EA. $1.30MC-l Capacitor1.25MFD Axial AmericanRadionics 5% EA..60VL-9SolenoidValve Approx . $46.00Wholesa le115 VAC Coi l 50-60 CY(Bra ss)10.5 watt sW' Pi pe inandout letsfor Gases, Liquid andSteam EA. $18.00DI-l 0K Asso rted Si gnal Di odeKit (10) Sig nal Diodes inReuseabl e Pak kit .50eML8205IC ToneRinger. DiagramFurn ished(Only14 Small Parts NeededToMakeExternal Ringer InsteadOf Bell EA. $1.90MC- l0K10 MylarCapacitorsAssorted(GoodUseabl e Values-l 0 Mylars kit$1.00TPU-l Pul se Transformer (Dime Size) 300 UH TPU-5 200 UH EA. .24eTH-K5 Tape Heads Assorted5 Tape Heads 5for $1.75TPU-K8PulseTransformer Asst. (DimeSize) (8) Pulse Transformersfor$1.50TRK-25 Small CaseTr ansistors (25) PC' S VeryAssort ed (25) for $1.90Anewl ist wil l beenc losedwi thea. order soorder now and keepa stepaheadBXK-l 3 x5 "IndexCard BoxwithHinged TopLoaded Witha GrabBagof AllSorts of Small Items(A Must for Exper iment ers) Yours AbsolutelyFree Wit han Order of $40.00 or Mor e. OtherwisePri ce EA. $3.25BXK- l Offer Expires Dec.10.1981 or Unti l StockisDepleted$15.00 MinimumOrder Add$2.50 Shipping Charges(Tenn. Residents Add 6.75%TaxCall Collect 615-242-7575 ToPlaceOrders OverS25.00(COD's Will beshippedonOrders Over S50.00 w/25 %Deposit )OrdersCan ~ e ShippedWit hin24Hrs. Wit hMoneyOrderJAVANCO150 Seco ndAve.. SouthNashvi lle. TN. 37201 (TryUs You'll Li ke Us)138enoZoa:I-oW~WoCi