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w i l l f l o w .I no r d e rt os p e e dt h i sf l o o d ,t h e yh a v ea ne x t e n s i v en e wr a n g ew i t hs e v e r a lv e r yi n g e n i o u sm a c h i n e s .A tt h el o wc o s te n d w eh a v et h e T I1 6 0 0 ,a s l i m l i n er e c h a r g a b l ea t £ 1 7 . 9 5 .E s p e c i a l l yf o rt h e s t u d e n t ,t h eT I3 0p o s s e s sn ol e s st h a nF I F T E E Nl e v e l so fp a r e n t h e s i s .I ta l s oh a sf u l ls c i e n t i f i cf a c i l i t i e s ,a n dw i l lt u r no f ft h e d i s p l a yi f y o u ' r ew a s t i n gb a t t e r yp o w e r .

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p r i n t i n gm a c h i n e s ,t h ef o r m e rp o r t a b l ea t £ 9 9 ,a n dt h el a t t e rd e s k- b o u n df o r£ 1 0 9 .P e r h a p st h em o s ta m a z i n go fa l li s t h eS R- 6 0 .D e f i n e da s ac a l c u l a t o ro n l yb e c a u s ei tr e q u i r e s n o p e r i p h et o w o r k ,i th a sa p o s s i b l e1 9 2 0p r o -g r a m m es t e p sa n d1 0 0m e m o r i e sT h ed i s p l a yi s a l p h a n u m e r ic ,a n d c a ni n t e r -r o g a t e t h eu s e ri fp r o g r a m m e dt o

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t o b e h o p e d w ed o n ' tg e ta n S Sm a c h i n ej u s t y e tV eh a v v a y so fm a k i n gy o u c o m p u t ea n d a l lt h a t ) .T h et i n g s t h eS R6 0w o n ' td oa r ev e r y- f e wi n d e e d ,b u tf o rc i r c a£ 1 5 0 0p e r -h a p st h i si s n o tt o os u r p r i s i n g . B e f o rw ea r ed e a f e n e db y c r y so f' M P U ' sr u l eO K 'l e tu sa d dh a s t i l yt h a tt h i si sn o ta nM P Um a c h i n e ,b u ti s c a l c u l a t o rc h i pb a s e d .

T h er a n g ea l lu s eT . I . ' sn e w( ? )A r i t h m e t i cO p e r a t i n gL o g i c ,s a i dt ob et r u l ya r i t h m e t i ci n o p e r a t i o n .I np r a c t i c ei t l o o k sl i k ea ni m p r o v e m e n to no r d i n a r ya r i t h m e t i cl o g i cc e r t a i n l y ,a n da n y t h i n gi s a n i m p r o v e m e n to nR P N

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T h eS c o p e x4 D 2 5n o wi n c l u d e sas p e c i a l' G l a r e c h e q 'g r a t i c u l ef o r' r e f e l e c t i o n - f r e e 'm e a s u r e m e n t .T h i sd o e sn o td e c r e a s et h eb r i l l i a n c eo ft h et r a c eo ri n c r e a s et h es p o ts i z eb u ta c t st od o w ne x t r a n e o u sr e f l e c t i o n .

A sa ' r e a c t i o na g a i n s td r a b n e s si ni n s t r u m e n t a t i o n ' ,a p l e a s a n ts h a d eo fb l u eh a sb e e ns e l e c t e df o rt h ef r o n tp a n e l ,a n dt h ec o n t r o l sa n d b e z e lh a v eb e e nc o l o u rm a t c h e d .

T e c h n i c a l l yt h e4 D 2 5o f f e r s3 %a c c u r a c yo nb o t ht i m ea n dv o l t a g em e a s u r e m e n t s ,a n di n c o r p o r a t e sa2 5 M H zb a n d w i d t hw i t hY- a m p l i f i e rs i g n a ld e l a y .A p a r tf r o mw h i c ht h i n kh o ww e l li tw i l lm a t c ht h ew a l l p a p e rP r i c e£ 2 4 5 .

S c o p e xI n t r u m e n t sL i m i t e d ,P i x m o r eI n d u s t r i a lE s t a t e ,P i x m o r eA v e n u e ,L e t c h w o r t h ,H e r t sS G 61 J J .I N3 x 1 0 6Y E A R S

T I M E ,I TW I L LB EO N ES E C O N DS L O W

R C Aa r ew o r k in gf o rt h eU SN a v yt od e t e r m i n et h ef e a s i b i l i t yo fu s i n gh y d r o g e nm a s e rc l o c k s- -p r e c i s et oo n e s e c o n d i nt h r e em i l l i o ny e a r s- - i nG l o b a l P o s i t i o n i n gS y s t e m s( G P S )s a t e l l i t e s .

T h e s es a t e l l i t e sa r ep a r to fa t r i-s e r v i c ep r o g r a m m eu n d e rA i rF o r c ed i r e c t i o n .N T S - 1w a sl a u n c h e di nJ u l y1 9 7 4a n dt e s t e dr u b i d i u mc l o c k s .N T S - 2w i l lt e s tc e s i u mc l o c k s ;N T S - 3w i l lt e s t h y d r o g e nm a s e rc l o c k s .

A p l a n n e dc o n s t e l l a t i o no f2 4G P Ss a t e l l i t e sw i l lb ec o n t i n u s o u s l yt r a n s -m i t t i n gt i m es y n c h r o n i z e ds i g n a l s .As h i p ,a i r p l a n eo rl a n dc r a f ts u i t a b l ye q u i p p e dt o r e c e i v et h es i g n a l s ,w i l lb ea b l et o d e t e r m i n ei t se x a c tp o s i t i o na n y w h e r eo nt h eg l o d e .

H y d r o g e na t o m sa r ee m p l o y e db e c a u s eo fa n e x t r e m e l ys t a b l ef i x e df r e q u e n c yg e n e r a t e du n d e rc e r t a i nc o n t r o l l e dc o n d i t i o n s .T h ea t o m sa r ep r o d u c e df r o mh y d r o g e ng a sm o l e c u l e sb ya n e l e c t r i c a ld i s c h a r g ea n db e a m e di n t pa s p e c i a l

c o n t a i n e ri n a m i c r o w a v ec a v i t y .T h eh y d r o g e na t o m su n d e r g oa ne n e r g ys t a t ec h a n g ea n de m i ta f r e q u e n c yt h a tc a nb eu s e dt ov e r ya c c u r a t e l yc o n t r o lt h eo u t p u tf r e q u e n c y .

C a ny o uj u s ts e et h et h i n gt i c k i n ga w a ym e r r i l yo ny o u rm a n t e l p i e c e ?T h eB B Cw o u l dh a v et op h o n ey o uf o ra t i m ec h e c k- a b o u t5 9 7 6A D£ 3 7 . 2 8 6P E RD I G I T

T h eD a t a P r e c i s i o n1 7 5i s a f u l lf u n c t i o n ,3 2r a n g eb a t t e r ya n dl i n eo p e r a t e di n s t r u m e n t ,w h o s eb a s i cs e n s i t i v i t yi s 1 0 0 m V .

W i t h5 r a n g e so fD C / A Cv o l t a g em e a s u r e m e n ta n d 1 0 0 %o v e r r a n g ec a p -a b i l i t yp e rr a n g e ,t h e1 7 5m e a s u r e sf r o m1 0 0 1 / Vt o 1 0 0 0 V ,p r o t e c t e dt o± 1 0 0 0 Vo n a n yr a n g e( i n c l u d i n g1 0 0 m V ) .B a s i ci n s t r u m e n ta c c u r a c yi s0 . 1 % ,a n dt h i si s a 1 y e a rs p e c i f i c a t i o no v e ra ± 5 0t e m p e r a t u r er a n g e .

R e s i s t a n c em e a s u r e m e n t sa r ec a t e r e df o rf r o m1 0 0 m & 2t o 2 0 M 2i n6 r a n g e s( b a s i ca c c u r a c yo fb e t t e rt h a n0 . 1 % ) .

A ' l o wv o l t a g e 'm o d ei s p r o v i d e dh a v i n gt h es a m er a n g e sa st h e n o r m a lr e s i s t a n c em e a s u r e m e n t ,b u tw i t ho n l y3 0 0 m Vo fo p e nc i r c u i te x c i t a t i o n .T h i se n a b l e sr e s i s t a n c em e a s u r e m e n t st o b e m a d eo n c i r c u i t sw h i l es t i l lc o n n e c t e dt os e m i c o n d u c t o rd e v i c e s .

T h e£ 1 2 0t h e M o d e l1 7 5c o s t sb r i n g s ,i na d d i t i o nt ot h eb a s i ci n s t r u -m e n t ,i t s r e c h a r e a b l eb a t t e r ym o d u l e ,a p a i ro ff u s ep r o t e c t e dt e s tl e a d s ,m a i n sl e a dw i t hc h a r g e r ,a l l i g a t o rc l i pa d a p t o r sa n da c o m p l e t ec e r t i f i c a t eo ft r a c e a b i l i t y .

P a r n e l lI n t e r n a t i o n a lI n s t r u m e n t sL i m i t e d ,S a n d b e c kW a y ,W e t h e r b y ,W e s tY o r k s h i r eL S 2 24 D H .

F I R S TL I V E4 - C H A N N E LB R O A D C A S T

L i v eq u a d r a p h o n i cb r o a d c a s t i n ge x p e r i m e n t s -h a v eb e e nc o n d u c t e db yR a d i oC l y d e ( t h ec o m m e r c i a ls t a t i o ns e r v i c i n gt h eG l a s g o wa r e a ) .F o u ra n da h a l fh o u r so ft h e " P r o m s7 6 "c o n c e r t s ,b y t h eS c o t t i s hN a t i o n a lO r c h e s t r a ,w e r eb r o a d c a s ti n f o u r-c h a n n e l m o d e ,d i r e c tf r o mK e l v i nH a l l ,G l a s g o w .o n J u n e2 6a n dJ u l y2 ,u s i n ge n c o d e ds i g n a l s .T h ee n c o d i n gs y s t e mu s e df o rt h i se x p e r i m e n tw a st h eS a n s u iQ SM a t r ix .

T h ee x p e r i m e n tf o l l o w so n eb yP i c c a d i l l yR a d i o- i nA p r i l- w h e r e ,a p a r tf r o mc e r t a i nr e c o r d sa l r e a d ye n c o d e d ,t h eS t a i o n ' so u t p u tf o rt w od a y sw a ss y n t h e s i z e dv i at h eQ Ss y s t e mi n t o4 - c h a n n e l .T h eI n d e p e n d e n tB r o a d c a s t i n gA u t h o r i t ym o n i t o r e da n dt r a n s m i s s i o n s .

W ec a no n l yh o p ef o rt h ee x p e r i m e n t st os p r e a d ,w i t hp e r h a p sg o o do l eA u n t i et a k i n ga h a n d( o rf o u r ) .N O ,T H EW H I S T L EI S N ' TD I G I T A L

T h i sh a n d - h e l db a t t e r y- p o w e r e ds t o p -w a t c hm e a s u r et i m e t o5 0m i n u t e s ,5 9 . 9s e c o n d s i no n e- t e n t h s e c o n di n t e r v a l s .C o n t r o l sa l l o ws i m p l es t a r t /s t o p , T i m eI N / T i m eO u t ,a n di n c l u d es a f e g u a r d a g a i n s ta c c i d e n t a lr e s e t .

A c c u r a c yi sc o n t r o l l e db ya q u a r t zc r y s t a l ,a n dt h e d i s p l a yL E D .W e i g h -i n g6 o z . ,t h eE T 1 0 5i sa p p r o x i m a t e4 1 / 2x 2 1 / 2x 1 ' / zi n s , a n dw i l ls l i pi n t oaj a c k e t p o c k e t .

P r i c et ob ea n n o u n c e d .N e w i t ta n dC o m p a n yL i m i t e d ,8 1 G o o d r a m g a t eY o r kY 0 12 L U .

I C I NC A M E R AC o n t a i n e di n a 1 6 p i nD I Pt h eZ N A 1 3 4i s a c o m p l e t es y s t e m ,r e q u i r -

i n go n l ya s i n g l e5 Vs u p p l y .A no n-c h i po s c i l l a t o r( w h i c hc a nb e o v e r -d r i v e n )e x t e r n a l l yp e r m i t sm u l t i p l eS P Gu n i tu s a g e .

T h eZ N A 1 3 4i n c o r p o r a t e ss u c hf e a t u r e sa s s y n c h r o n i s i n gb e t w e e nu n i t s ,d i r e c tr e s e tt o h o r i z o n t a la n dv e r t i c a lc o u n t e r s ,f a c a i l i t ie sf o ra d d i n ga n ds u b t r a c t i n gl i n e s ,a u t o m a t i ci n t e r -l a c i n ga n da f ie l dr e f e r e n c eo u t p u t .P e r h a p si t sm o s tn o v e lf e a t u r ei s i t sa b a i l i t yt op r o v i d eb o t hC C I Ra n dE I Ae q u a l i s a t i o nb yc h a n g i n gt h ev o l t a g eo na s i n g l ep i n .

T h eZ N A 1 3 4g e n e r a t e sa l lt h eh o r i z o n t a l ,v e r t i c a l ,m i x e db l a n k i n ga n ds y n c h r o n i s i n gp u l s e sn e c e s s a r yf o rr a s t e rg e n e r a t i o ni n 6 2 5

o r5 2 5 l i n ec o m m e r c ia l ,i n d u s t r i a lo rm i l i t a r yT Vs y s t e m s .I tc a nb es u p p l i e dt oo p e r a t eo v e rt h em i l i t a r yt e m p e r a t u r er a n g e s .

F e r r a n t iL i m i t e d ,E l e c t r o n i cC o m p o n e n t sD i v i s i o n ,G e mM i l l ,C h a d d e r t o n ,O l d h a mO L 98 N P .


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4 4 Q4 2C r i c k l e w o o dB r o a d w a yL o n d o nN W 23 E TT e l :0 1 - 4 5 2 0 1 6 1 / 2T e l e x :2 1 4 9 2& 8 5W e s tR e g e n tS tG l a s g o wG 22 Q DT e l :0 4 1 - 3 3 24 1 3 3& 1 S t r a i t sP a r a d eF i s h p o n d sB r i s t o lB S 1 6 2 L XT e l :0 2 7 2 - 6 5 4 2 0 1 / 2& 2 7R u eD a n t o nI s s yL e sM o u l i n e a u xP a r i s9 2

C a l li na n ds e eu s9 - 5 . 3 0M o n - F r i9 - 5 . 0 0S a t T r a d ea n de x p o r te n q u i r i e sw e l c o m e . C a t a l o g u ep r i c e4 0 p( 3 0 pt o c a l l e r s ) .

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l a r g e s tr a n g ei n t h eU K2 9 4 5 6 1 . 4 0 0 . 3 72 N 5 2 9 50 . 4 0A F 1 8 6 0 . 5 02 9 4 5 6 41 . 5 42 N 3 3 9 10 . 2 92 5 5 2 9 60 . 3 6A 1 2 0 0 0 . 7 02 9 4 5 7 41 . 7 02 5 3 3 9 1 40 . 3 42 5 5 2 9 80 . 3 64 1 2 3 9 0 . 7 42 9 4 9 0 4 . 6 02 5 3 3 9 20 . 1 4 2 5 5 4 5 70 . 2 9A F 2 4 0 0 . 9 02 9 4 9 1 5 . 1 02 N 3 3 9 30 . 1 52 5 5 4 5 80 . 2 6A F 2 7 9 0 . 8 02 9 4 9 2 5 . 7 52 N 3 3 9 40 . 1 52 5 5 4 5 90 . 2 9A F 2 8 0 0 . 8 52 9 4 9 3 5 . 9 82 5 3 4 0 20 . 3 0 2 5 5 4 9 20 . 4 2A L 1 0 2 1 . 5 0 '2 9 6 9 6 0 . 2 52 N 3 4 1 40 . 1 5 2 5 5 4 9 40 . 4 5A L 1 0 3 1 . 5 02 N 6 9 7 0 . 1 62 5 3 4 1 50 . 1 7 2 5 5 4 9 60 . 5 0B C 1 0 7 0 . 1 42 5 6 9 8 0 . 8 22 5 3 4 1 60 . 2 3 2 9 5 7 7 70 . 4 5B C 1 0 8 0 . 1 22 N 6 9 9 0 . 5 52 5 3 4 1 70 . 2 72 9 6 0 2 70 . 4 5B C 1 0 9 0 . 1 52 5 7 0 6 0 . 1 22 N 3 4 4 00 1 5 7 3 9 ' 2 8 0 . 5 0B C 1 1 3 0 . 1 72 9 7 0 6 4 50 . 1 22 N 3 4 4 10 . 7 83 5 1 3 9 1 . 4 5B C 1 1 5 0 . 1 92 N 7 0 8 0 . 2 12 N 3 4 4 21 . 2 03 9 1 4 0 0 . 8 5B C 1 1 6 0 . 1 92 5 7 0 9 0 . 5 02 5 3 6 3 80 . 1 6 3 5 1 4 10 . 8 5B C 1 1 6 A0 . 2 02 5 7 1 1 0 . 5 52 9 3 6 3 8 40 . 1 63 5 2 0 0 2 . 6 0B C 1 1 7 0 . 2 22 N 7 1 8 0 . 2 22 5 3 6 3 90 . 3 04 0 3 6 1 0 . 4 5B C 1 1 8 0 . 1 62 5 7 1 8 40 . 4 02 9 3 6 4 10 . 2 0 . 4 0 3 6 20 . 4 8B C 1 1 9 0 . 3 02 N 7 2 0 0 . 6 92 N 3 7 0 20 . 1 7 4 0 3 6 31 . 0 0B C 1 2 1 0 . 4 52 5 9 1 4 0 . 2 22 9 3 7 0 30 . 1 5 4 0 3 8 90 . 5 0B C 1 2 5 0 . 1 82 N 9 1 6 0 . 4 32 N 3 7 0 40 . 1 5 4 0 3 9 41 . 2 0B C 1 2 6 0 . 2 52 5 9 1 8 0 . 3 42 N 3 7 0 50 . 1 5 4 0 3 9 51 . 2 0B C 1 3 2 0 . 3 02 5 9 2 9 0 . 2 52 9 3 7 0 60 . 1 44 0 4 0 6 0 . 4 5B C 1 3 4 0 . 1 5

' 2 N 9 3 0 0 . 2 62 5 3 7 0 70 . 1 84 0 4 0 70 . 3 8

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2 N 1 3 0 20 . 3 7 2 5 3 7 0 80 . 1 4 4 0 4 0 80 . 5 0B C 1 3 6 0 . 1 92 N 1 3 0 30 . 4 5 2 5 3 7 0 90 . 1 5 4 0 4 0 90 . 5 5B C 1 3 7 0 . 1 42 5 1 3 0 40 . 4 0 2 5 3 7 1 00 . 1 4 4 0 4 1 00 . 5 5 8 0 1 4 00 . 6 02 9 1 3 0 50 . 4 02 9 3 7 1 10 . 1 5 4 0 4 1 12 . 3 0B C 1 4 1 0 . 6 52 5 1 3 0 60 . 3 12 9 3 7 1 21 . 2 04 0 5 9 4 0 . 7 5B C 1 4 2 0 . 3 02 N 1 3 0 70 . 3 0 2 5 3 7 1 32 . 3 04 0 5 9 5 0 . 8 55 0 1 4 3 0 . 3 02 5 1 3 0 80 . 6 0 2 5 3 7 1 42 . 4 54 0 6 0 1 0 . 7 0B C 1 4 7 0 . 1 02 5 1 3 0 90 . 6 0 2 9 3 7 1 52 . 4 54 0 6 0 2 0 . 5 0B C 1 4 8 0 . 1 02 5 1 6 7 11 . 8 02 9 3 7 1 62 . 6 04 0 6 0 3 0 . 6 0 B C 1 4 9 0 . 1 32 5 1 6 7 1 41 . 9 22 5 3 7 7 11 . 6 04 0 6 0 4 0 . 6 0B C 1 5 3 0 . 2 72 N 1 6 7 1 62 . 1 22 9 3 7 7 21 . 7 04 0 6 3 6 1 . 1 5B C 1 5 4 0 . 2 72 5 1 7 1 10 . 2 72 5 3 7 7 32 . 6 54 0 6 7 3 0 . 7 3B C 1 5 7 0 . 1 22 5 1 9 0 75 . 5 02 5 3 7 7 93 . 1 5A C 1 2 6 0 . 3 78 C 1 5 8 0 . 1 12 5 2 1 0 20 . 6 02 N 3 7 9 02 . 7 5A C 1 2 7 0 . 4 4B C 1 6 0 0 . 7 82 N 2 1 4 71 . 4 02 5 3 7 9 12 . 7 5A C 1 2 8 0 . 5 7 , B C 1 6 7 80 . 1 22 5 2 1 4 81 . 6 52 N 3 7 9 22 . 9 0A C 1 5 1 V0 . 3 5 ' 8 0 1 6 8 B0 . 1 22 5 2 1 6 01 . 1 02 9 3 7 9 40 . 2 6A C 1 5 2 V0 . 5 0B C 1 6 8 C0 . 1 22 5 2 2 1 8 40 . 4 72 N 3 8 1 00 . 2 6A C 1 5 3 0 . 4 0B C 1 6 9 B0 . 1 22 5 2 2 1 90 . 4 22 5 3 8 2 00 . 2 9A C 1 5 3 K0 . 4 2B C 1 6 9 C0 . 1 22 5 2 2 1 9 40 . 5 22 5 3 8 2 30 . 6 1 A C 1 5 40 . 4 51 3 0 1 7 0 A0 . 1 62 N 2 2 2 00 . 3 52 N 3 9 0 40 . 2 1 A C 1 7 60 . 4 0B C 1 7 1 0 . 1 42 N 2 2 2 10 . 2 22 5 3 9 0 60 . 2 2 4 0 1 7 6 K0 . 4 5 8 0 1 7 20 . 1 22 5 2 2 2 1 40 . 2 52 9 4 0 3 60 . 6 7A C 1 8 7 K0 . 4 0B e 1 7 7 0 . 1 92 9 2 2 2 20 . 2 52 5 4 0 3 70 . 5 5A C 1 8 8 K0 . 4 58 0 1 7 8 0 . 1 82 9 2 2 2 2 40 . 2 52 N 4 0 5 80 . 2 04 0 1 4 2 0 . 6 5B C 1 7 9 0 . 2 12 9 2 3 6 80 . 1 72 1 1 1 4 0 5 90 . 1 54 0 1 4 3 0 . 7 5B C 1 8 2 0 . 1 12 9 2 3 6 9 40 . 2 12 5 4 0 6 00 . 2 0 4 0 1 4 90 . 7 45 0 1 8 2 8 8 00 . 1 42 9 2 3 6 90 . 2 52 5 4 0 6 1 0 . 1 7 A D 1 5 01 . 2 0B C 1 8 3 0 . 1 12 5 2 6 4 60 . 5 52 5 4 0 6 20 . 1 8A 0 1 6 1 1 . 2 3B C 1 8 3 L0 . 1 42 9 2 6 4 71 . 1 02 5 4 1 2 60 . 1 74 0 1 6 2 1 . 2 3B C 1 8 4 0 . 1 22 9 2 9 0 40 . 3 62 5 4 2 8 90 . 3 0A F 1 0 6 0 . 4 5B C 1 8 4 L0 . 1 42 5 2 9 0 4 40 . 3 72 9 4 9 1 90 . 8 5A F 1 1 4 0 . 6 50 0 2 0 7 0 . 1 12 5 2 9 0 50 . 3 72 9 4 9 2 00 . 9 0A F 1 1 5 0 . 6 5B C 2 0 8 0 . 1 02 9 2 9 0 5 40 . 3 52 5 4 9 2 10 . 6 0A F 1 1 6 0 . 6 5 .B C 2 1 2 0 . 1 42 5 2 9 0 60 . 2 82 5 4 9 2 20 . 6 5A F 1 1 7 0 . 6 5B C 2 1 2 L0 . 1 42 5 2 9 0 6 40 . 2 52 5 4 9 2 30 . 7 04 1 1 1 8 0 . 6 5B C 2 1 4 L0 . 1 72 N 2 9 0 70 . 2 12 5 5 1 9 00 . 7 0A F 1 2 4 0 . 6 5B C 2 3 7 0 . 1 42 5 2 9 0 7 40 . 2 22 5 5 1 9 11 . 3 0A F 1 2 5 0 . 6 58 0 2 3 8 0 . 1 22 5 2 9 2 40 . 1 52 5 5 1 9 21 . 0 0A F 1 2 6 0 . 6 51 3 0 2 3 9 0 . 1 52 N 2 9 2 60 . 1 32 5 5 1 9 57 . 1 0A F 1 2 7 0 . 6 5B C 2 5 1 0 . 1 52 N 3 0 5 30 . 2 52 5 5 2 4 50 . 3 5A F 1 3 9 0 . 6 9 8 0 2 5 30 . 2 22 5 3 0 5 40 . 5 02 5 5 2 9 40 . 4 0 B C 2 5 7 A0 . 1 72 5 3 0 5 50 . 6 5 5 0 2 5 8 40 . 1 7

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P O W E RS U P P L YT h eT T La n dM O S R A M r e q u i r eas t a b i l i s e d5 vs u p p l ya t a b o u t1 Ac u r r e n t ;t h i si s m o s tc o n v e n i e n t l ys u p p l i e db yt h ew e l l - k n o w nL M 3 0 9

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v o l t a g er e g u l a t o r w h i c hu s e st h em e t a lc a s ea s a h e a t s i n ka n dag r o u n d p l a n e .T h eM O S R O M( 2 5 1 3c h a r a c t e rg e n e r a t o r ) r e qs u p p l i e so f 5 v , G N D ,- 5 va n d- 1 2 v ,a l l a tv e r yl o wc u r r e n tl e v e l s ;t h e- 5 a n d- - 1 2 vs u p p l i e sa r ed e r i v e df r o ma s e c o n dw i n d i n go nt h et r a n s f o r m e r w i t hV d da s ac o m m o ng r o u n d .T h ec i r c u i td i a -g r a mo ft h ep o w e rs u p p l ys h o w st h e

1 0 E L E C T R O N I C ST O D A YI N T E R N A T I O N A L - S E P1 9 7 6


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t w ot r a n s f o r m e rw i n d i n g sr e c t i f i e db yD 1 - 4a n dD 5 - 8 a n d s m o o t h e db yC 1 a n d C 2 .T h eo u t p u tf r o mC li su s e dt o f e e d t h ev o l t a g e r e g u l a t o rR E G 1w h i c h o u t p u t sa r e g u l a t e d 5 va t u pt o 1 A m p ,L E D 1a n dR 1 a r eu s e da s a p a n e ll a m p t oi n d i c a t e ." P o w e rO n " .T h eo u t p u tf r o mC 2w i l lb e i n t h ea r e ao f- 1 5 v ;t h i si sl i m i t e db yz e n e rD 9 t o- 1 2 va n di nt u r n t h i s- 1 2 vi s l i m i t e dt o - 5 vb yz e n e r0 1 0 .N oi n d i c a t o r sw e r eu s e dh e r eb u ta nL E Dc o u l db ec o n n e c t e da c r o s sC 2 ( w i t h s u i t a b l el i m i t i n gr e s i s t o r )t o g i v ea p a n e li n d i c a t i o nt h a t b o t hp o s i t i v ea n dn e g a t i v es u p p l i e sw e r eo n .

N o t et h a tt h et r a n s f o r m e rm u s th a v et w os e p a r a t ew i n d i n g s ( 1 2 - 0 ,1 2 - 0 ) ;a 1 2 - 0 - 1 2c e n t r e- t a p p e dt y p ew i l ln o td o .

B O A R D` B 'T h eb l o c k d i a g r a mo fb o a r d' B 'i ss h o w ni n F i g 3 .I t sf u n c t i o ni s t og e n e r a t eT V s y n cs i g n a l sa n dc h a r a c t e rv i d e oi n f o r m a t i o na n dt h e nt om i x t h e s et w os i g n a l sw i t hab l a n k i n gs i g n a lt o p r o d u c eas t a n d a r dv i d e o s i g n a lf o r i n p u tt o am o d i f i e dT V s e t .

T h es y n cg e n e r a t o ri s f o r m e db yt w o5 5 5t i m e r si n a s t a b l em o d eb o t hw i t ha m a r k / s p a c er a t i oo fa b o u t1 0 : 1 .I C 1r u n sa t5 0 H za n dI C 2 a t1 5 K H z .T h eo u t p u t sf r o mt h e s eI C sc o n s i s to fä s h o r tn e g a t i v ep u l s ef r o me a c hw h i c ha r em i x e di nI C 5t o g i v ea m i x e d s y n cs i g n a l .W ew i l lr e f e r t ot h e s e s i g n a l sa s F S( F r a m eS y n c ) ,L S ( L i n e S y n c )a n dM S Y N .I C 3a n dI C 4a r e5 5 5t i m e r si n t h em o n o s t a b l em o d e .I C 3u s e sF S a sa t r ig g e ri n p u ta n dp r o d u c e sa no u t p u tc a l l e dF S D( F r a m eS y n cD e l a y )w h i c hi s b a s i c a l l yF Si n v e r t e db u tw i t ht h el e n g t ho f t h e s h o r tp u l s ea d j u s t a b l eb yV R 3 .T h ew i d t ho ft h i sp u l s ei s u s e dt o d e f i n et h ed i s t a n c ef r o m t h et o po ft h es c r e e na tw h i c ht h eo u t p u tw i l ls t a r ta n dt h e s i g n a li s u s e dt ob l a n kt h ev i d e oa n dt o r e s e tl i n e a n dr o w c o u n t e r s .I C 4p r o d u c e sa s i m i l a rs i g n a l( L S D )w h i c hd e f i n e st h e d i s t a n c ef r o m t h el e f t - h a n ds i d eo ft h es c r e e na n di su s e dt o b l a n kt h ev i d e oa n d a l s or e s e t st h eM a s t e r C l o c k( M C L K )a n dc h a r a c t e rc o u n t e r s .

T h eM a s t e rC l o c k( M C L K )i sg e n e r a t e du s i n gt w og a t e so fI C 5w h i c hw i l lo s c i l l a t ea t a b o u t6 M H zw h e n e v e rL S Di s l o w .A s L S Da l w a y sg o e sl o wa tt h es a m e" t i m e "o ne a c hT Vl i n eM C L K a l w a y ss t a r t sa t t h es a m ep o s i t i o no n e a c hT Vl i n e ;t h i si s v e r yi m p o r t a n tt o a v o i dr a g g e de d g e so r v e r t i c a l so n t h ec h a r a c t e r s .

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V I D E OG E N E R A T O RI C 1 5i s a 7 4 2 14- i n p u tA N D g a t e( n o t en o ta 7 4 2 0N A N D )w h i c hm i x e st h eb l a n k i n g s i g n a l sR C L K ,F B L K ,L B L K I ,a n dB L N K .R C L K

o c c u r so nt h el a s tt w oo fe v e r yt e nT Vl i n e sa f t e rF S D ,t h i s t h u sb l a n k sa tt h eb o t t o mo fe a c hc h a r a c t e rr o w .F B L Ka n dL B L K Ia r e f r o mt h ef l i p - f l o p sI C 1 3 - 1 4 ,t h eF B L Ks i g n a li s s e tb y F S Da n dr e s e tb y E O Fw h i c hi s g e n e r a t e dw h e nt h et e x tr o wc o u n t e re x c e e d st h en u m b e ro fr o w s( 8 a tp r e s e n t ) .L B L K Ii s f o r m e di n a s i m i l a rm a n n e r .T ot e s t b o a r d" B "c o n n e c ta t e m p o r a r yl i n kf r o mL B L K Ot o L B L K I .B L N Ks i g n a li sg e n e r a t e dt o " f l a s h "t h eo u t p u tc h a r a c t e r ,i t c a nb el e f t u n c o n n e c t -e da tp r e s e n t .I C 1 5o u t p u t( B V I D )i sm i x e dw i t ht h e c h a r a c t e rv i d e o( C V I D )f r o mt h e c h a r a c t e rg e n e r a t o ra n dm u l t i p l e x e ra n dt h e nm i x e dw i t hM S Y Nt oe m e r g ef r o mI C 16 a ss o m e t h i n gc l o s et oa s t a n d a r dv i d e os i g n a l .I fw e m i xt h i s s i g n a lr e d u c e d

b ya b o u t5 0 %w i t ht h ef u l ls c a l eM S Y N. w eh a v ea s t a n d a r dv i d e os i g n a lw i t ht h e l a r g en e g a t i v et r o u g h sf r o mM S Y N v e r ya p p a r e n ti fs e e no na s c o p e .

I fy o ub u i l du pb o a r d" B "w i t hI C s1 - 6a n d1 3 - 1 6a n da s s o c i a t e dc o m p o n e n t sy o us h o u l dn o w b ea b l et o p r o d u c ea v i d e o p i c t u r eo nt h es e t .S e ta l lp r e s e t st o m i d w a ya n dt u r no n , a d j u s tV R 1u n t i lp i c t u r e s t o p s" r o l l i n g "a n dt h e na d j u s tV R 2 u n t i lp i c t u r e s t a b ih o r i z o n t a l l y .I t w a sf o u n d t h a tF Sa n dL S s o m e t i m e sd r i f t e d o f fa f t e rw a r m i n gu pa n dt h u sV R 1a n d V R 2m a yn e e da d j u s t i n gd u r i n gu s e .Y o um a yp r e f e rt o u s ep a n e l- m o u n t e dp o t e n t i o m e t e r si n p l a c eo f o ri n

a d d i t i o nt o t h e b o a r d- m o u n t e dp r e s e t s .H a v i n g s t a b i l i s e dt h e p i c t u r ey o u

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b e c o m ea c h a r a c t e rr o w .A d j u s tV R 3u n t i lt h ef i r s to ft h e s er o w si sa b o u tt w oi n c h e sf r o mt h e t o po ft h es c r e e na n dt h e n a d j u s tV R 4u n t i lt h el i n e s s t a r ta b o u to n ei n c hf r o mt h el e f t h a n ds i d eo ft h es c r e e n .I fy o ud o n o th a v ea c c e s st o a no s c i l l o s c o p et h e n t h eT V s c r e e nc a nn o wb eu s e dt o t e s to u te a c hp a r to fc o n s t r u c t i o n .D I S C O N N E C TP O W E RS U P P L YA N DC O N N E C -T I O NT O T V B E F O R ES O I . D E R I N GE A C HT I M E .

I C S8 - 1 2c a nn o wb e m o u n t e da n dt h es u p p l ya n dT Vr e c o n n e c t e d .

T h i ss h o u l dn o w s h o we a c hw h i t er o wn o ws p l i tu pi n t ow h i t eb o x e s .Y o um a ya l s oh a v ew h i t ev e r t i c a ll i n e s t h e s a m ew i d t ha s t h e b o x e sa b o v e t h eF S Dl i n e ; d on o tw o r r ya b o u tt h i sa tt h i ss t a g e .C o u n t t h eb o x e sf r o mt h el e f ta n da d j u s tV R 5u n t i ly o uh a v ea b o u t3 4 - 3 5b o x e sa c r o s s e a c hr o w .W h e nt h eE O Fa n dE 0 , 1 _s i g n a l sa r ec o n n e c t e df r o mb o a r d" C "t h e b o x e sw i l lb eb l a n k e da f t e rn u m b e r3 2a n d t h er o w s 'w i l lb e b l a n k e d a f t e rn u m b e r8 ,t h u sg i v i n go u r d i s p l a y" b o x " .

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p o w e r s u p p l i e s( n o t eM O Sh a n d l i n gp r e c a u t i o n s )a n dr e c o n n e c ts u p p l ya n dT V .A s s u m i n gt h a ta l lo ft h e6d a t ai n p u tl i n e st o I C 7a r eo p e nc i r c u i te a c hc h a r a c t e rb o xw i l ls h o we i t h e ra n " a t "s i g n" @ "o r aq u e s t i o n m a r k" ? "o ra m i xo f b o t h .T h ei n p u t sm a yp i c ku ps t r a y5 0 H zr a d i a t i o na n ds w a pb e t w e e na l lh i g h( " ? " )a n da l ll o w( " @ " ) .W h e ny o uh a v eb e c o m eb o r e dw i t hw a t c h i n gi ty o uc a n c e l e b r a t eb e i n ga b o u th a l fw a yt o c o m p l e t i o n .

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B O A R D' C 'A b l o c k d i a g r a mo fb o a r d" C "i ss h o w na sF i g6 ;a s s e m b l yi s a l m o s ta ss i m p l ea si t l o o k s .

S t a r tb yi n s e r t i n gI C s1 7 - 1 9a n dc o n n e c t i n gC C L K ,R C L K ,F S Da n dL S Df r o mb o a r d" B "a n dE O Fa n dE O Lb a c kt o b o a r d" B " .T h er e s u l t so nt h e s c r e e ns h o u l d n o wb e t h a tw e h a v ef i n i s h e dd e f i n i n go u rd i s p l a yb o xo f3 2 c h a r a c t e r sw i d eb y 8 r o w sh i g hw i t h f l i p - f l o p sI C 1 3 - 1 4n o w w o r k i n gc o r r e c t l yb yb l a n k i n ga n yv i d e og e n e r a t e do u t -s i d eo u rb o x .

A D D R E S SC O M P A R A T O RA n y p o s i t i v et r u el o g i ca d d r e s si n p u t f r o ms w i t c h e so ro t h e rl o g i ci n p u tt o I C 2 0 - 2 1w i l lb ei n v e r t e db yt h e s eI C si fE N A B L Ei s c o n n e c t e d t ol o g i c" 1 " ;i fE N A B L Ei sa tl o g i c" 0 "t h e nt h i sw i l lc a u s ea l l8 o u t p u t st og o h i g ht h u s a l m o s te f f e c t i v e l yd i s a b l i n gt h ea d d r e s si n p u t s .T h eE n a b l es i g n a li s n o tu s e di n t h eb a s i cu n i ta n ds h o u l db ec o n n e c t e dt o a p e r m a n e n tl o g i c" 1 "o r v i aa1 Kr e s i s t o rt o V s s . I fw ec o n s i d e ro u t p u t" C "f r o m I C 1 9a n dt h ei n v e r t e dH i n p u ta d d r e s s l i n e w ec a nI p o k a tt h ee x p e c t e do u t p u tf r o mt h e7 4 8 6t ow h i c ht h e ya r ec o n n e c t e d .A 7 4 8 6i s a nE X C L U S I V EN O Rg a t ea n dt h e l o g i co fE X- O Ri s a l o g i c" 1 "i fe i t h e rb u tn o tb o t hi n p u t sa r ea t l o g i c" 1 " ,t h eo u t p u t" 1 "i si n v e r t e dt ol o g i c" 0 "b e c a u s et h i si sa n E XN O Rg a t e n o tE X- O R .T h u sw ew i l lg e ta l o g i c" 1 "w h e n e v e re i t h e r1 9 Ci s l o wa n dH i s h i g h( Hl o w )o ri f 1 9 Ci s h i g ha n dH i s l o w

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( H h i g h ) ,o ri n p l a i n l a n g u a g ew eg e ta l o g i c" 1 "i f1 9 Ci s t h es a m el o g i cl e v e la s i n p u tH a n da " 0 "i ft h e ya r e d i f f e r e n t .E a c h7 4 8 6o u t p u tc a nb e c h e c k e db y l e a v i n gA- H i n p u t sh i g ha n dl i n k i n ge a c h7 4 8 6o u t p u ti n t u r nt o B L N Ki n p u tt o I C 1 5 .T h er e s u l t ss h o u l db e a s

f o l l o w s :1 9 C- H o u t p u ts h o u l db eh i g hd u r i n gt e x t r o w s5 - 8a n dl o wd u r i n g1 - 4 .A sa l o wi n p u tt o B L N Kw i l lt u r n o f ft h e d i s p l a yw ew o u l de x p e c tt e x tr o w s1 - 4 t ob et u r n e do f f ,1 9 Cw i l lb e t h e i n v e r s eo ft h i sa n dt h u s t h e1 9 Ci n p u tt o t h e7 4 8 6c o n n e c t e dt o B L N Kw i l lt u r no f fr o w s5 - 8 a n dt h e7 4 8 6o u t p u tw i l lt u r no f fr o w s1 - 4 .S i m i l a r l y , c o u n t e ro u t p u t1 9 Bw i l le x t i n g u i s hr o w s3 ,

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