IC Tester _ Electronics Project _ Electronics Project.pdf

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IC TesterAlthough ICs 741 and timer 555 are rare and expensivethese ICs are frequently used ICs even by an averagehobbyist and electronics students. They are veryversatile and damage resistant too. Therefore we havedesigned the IC tester for timer IC 555 And Op-Amp IC741

The tester described here test both the ICs [Timer 555 and Op-Amp 741] instantly. The circuit here usesonly a few resistors, switches, sockets and capacitors which cost around $3 including the PCB and the 7-segment display. The tester we design is equally useful for a factory and the student of electronics.

PART LISTSemiconductors

IC1 555 Timer

IC2 741 Op-Amp

D1,D2 5mm LEDs [Light Emitting Diode]

DIS1FND507/LT542 Common Anode

Display

Resistors (all 0.25 watt 5% carbon)

R1 12 kilohm

R2 68 kilohm

R3,R4 10 kilohm

R5 TO R12 1 kilohm

Capacitors

C1 5F, 16V electrolytic

C2 47F, 10V electrolytic

Miscellaneous

S1 On/Off toggle Switch

S2DPDT miniature switch for

mounting on PCB

BATT 9-Volt, battery

OTHRESIC socket, PCB, connecting wires,

enclosure, hardware etc

Circuit Description

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Form the circuit diagram it is clear that the heart of this tester is the astable multi vibrator formedaround 1C 555 which is approximately 2 Hz frequency. So, the output LED D1 (connected through linka and b snow in the circuit) blinks at a rate of 2 Hz if the IC 555 inserted in the socket works well.Thisoutput at pin 3 of IC 555 is also given through a DPDT (Double Pole Double Throw switch) to the pins2and pin3 of IC 741 op-amp. The switch S2 selects the inverting or non-inverting input of the IC 741 . Inthis way the LED D2 ( connected through link c and d snow in the circuit) also blinks at of 2Hz rate ifthe IC 741 inserted is OK. If S2 selects inverting mode, then D1 and D2 blink alternately and if S2 selectsnon-inverting mode then D1 and D2 blink simultaneously. You may use 3V to 12V DC supply voltagesafely. However, 9V DC is recommended.

More About circuit

As an interesting feature which gives a digital display without any confusion, you may use a commonanode seven segment display. With op-amp IC 741 in inverting mode, the display shows 7 and 5alternately. In the non-inverting mode it shows 9 and 0 alternately.

Common Anode display Configuration for connecting Display with circuit ( Please connect the A , C and B or Dto the correspondingpoint in the circuit.:

Both, the two LEDs and digital display options are givencircuit diagram. You can also use a common anodedisplay having a damaged decimal dot and / or segmente which are not used here

Common Cathode display Configuration for connectingDisplay with circuit ( Please connect the A and C tothecorrespondingpoint in the circuit.:

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You may also use a common cathode display here by just interchanging the connections of commoncathode from positive to the negative of the supply on the PCB near the switch S2. Similarly,interchange the connections of R7 and R8 from negative to positive of the supply.

PCB Layout

PLEASE NOTICE

It has been noted that when both IC 741 and 555 are faulty or in non-operating condition, the displayshows 7 (but there is no change in the display while changing the switch S2), and when IC 555 isworking and 741 is in non-operating condition the display shows 5 and 7 alternately and when IC 555 isnot working but 741 is alright, then display shows 7 in inverting mode and 7 in non-inverting mode, butdoes not flash.

Related Project

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Filed Under: IC 555

Have You Say!Please leave your Suggestions , Feedback , queries and comments through the comment section below. Wewill do our best to reply to your comment within 12-24 hours. P.S. Emails regarding project helps will be strictly ignored ; so please use this Comment form instead.

Comments

ahmad says:January 30, 2013 at 3:04 pm

intresting but can u give me a hint on how to connect 7 segment display to ic 741 to read outtemperature instead of a multimeter?

Reply

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Electroinics Project Admin says:February 26, 2013 at 11:03 pm

Yeah As shown on the image above first of all connect registers to the required pins of SevenSegmented Display and then connect the points A,C, (B or D) to the A,C, (B or D) of the circuit if itis a common anode Display and to point A and C of the circuit if it is a common Cathode display.

Reply

ashwini says:February 26, 2013 at 9:31 pm

Its interesting and informative. if more information regarding the connection using LED displaywould made still more better.

Reply

Electroinics Project Admin says:February 26, 2013 at 11:04 pm

You can just connect two leds in between the points: A;B and C;D in the circuit.

Reply

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IC Tester _ Electronics Project _ Electronics Project.pdf