Although ICs 741 and timer 555 are rare and expensive these ICs are frequently used ICs even by an average hobbyist and electronics students. They are very versatile and damage resistant too. Therefore we have designed the IC tester for timer IC 555 And Op-Amp IC 741
The tester described here test both the ICs [Timer 555 and Op-Amp 741] instantly. The circuit here uses only 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.
Semiconductors
IC1 - 555 Timer
IC2 - 741 Op-Amp
D1,D2 - 5mm LEDs
[Light Emitting Diode]
DIS1 - FND507/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 - 5μF, 16V electrolytic
C2 - 47μF, 10V electrolytic
Miscellaneous
S1 - On/Off toggle Switch
S2 - DPDT miniature switch for mounting on PCB
Battery - 9 Volt, Battery
Othres
IC socket, PCB, connecting wires, enclosure, hardware etc
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