The op-amp IC 741 is a DC-coupled, high gain differential amplifier with external negative feedback. IC 741 is characterized by almost infinite open loop gain (100,000), almost infinite input impedance (2MΩ) and almost zero output impedance (75Ω). IC 741 is most popular, cheap and easy to use op-amp. Various type of circuit is designed using Op-amp 741 out of which some are voltage follower, current to voltage converter and vice versa, summing amplifier etc.
Various type of circuit based on op-amp 741 is already posted in www.bestengineeringprojects.com on op-amp section. Now here is a simple circuit operational amplifier 741 tester which test op-amp 741 either is good or fault.
The circuit of operational amplifier 741 tester comprises two diode and very few passive components and a 741 IC to be test. All the components are connected as shown in circuit diagram. A LED1 is used to indicate either IC is good or fault. Glowing LED1 indicate IC is good.
PARTS LIST OF OPERATIONAL AMPLIFIER TESTER
Resistor (all ¼-watt, ± 5% Carbon)
R1 – R4 = 10 KΩ
R5 = 4.7 KΩ
R6 = 1 KΩ
C1 = 10 µF/16V (Electrolytic Capacitor)
IC1 = 741 (IC to be test)
D1, D2= 1N4007 or 1N3002
LED1 = Any Color LED