How to test Opamp 741?

Hello guys, i am making a wireless switch circuit using LM741 Opamp IC following the below circuit diagram. But the circuit is not working, Is there any mistake in the circuit ? I double checked the connections but didn't find any false connections, so I think op-amp IC is faulty. So is there is any way to test opamp whether it is working properly or not?

Thank you....

Wireless-Switch-Circuit.png

Thanks guys, I tested my Op-amp and found that it is working properly. So I again checked my circuit and found that the culprit was my 9V battery.

When measured at no load the battery has a potential of 7.2V but when connected to load it drops to 3.7V which is not enough for the circuit to work. I replaced the battery with a fresh 9V one  and the circuit is not working fine.

Thanks again 

  Joined September 03, 2018      2
Monday at 02:26 PM

marry roser

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Working of the circuit is simple and straight forward. The IC to be tested is configured in voltage comparator mode. Voltage at pin 3 (non inverting pin) is fixed where voltage at pin 2 (inverting pin) varying due to charging and discharging of capacitor C1.

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  Joined November 21, 2019      36
Thursday at 02:40 PM

jaksonlee

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Working of the circuit is simple and straight forward. The IC to be tested is configured in voltage comparator mode. Voltage at pin 3 is fixed where voltage at pin 2 varying due to charging and discharging of capacitor C1.Where battery is connected to the circuit the voltage at pin 3 is high in compare to voltage at pin 2 due to charging of capacitor, as a result output of IC become high and LED start to glow.

At this instant capacitor start to charge through the resistor R4. When charge (voltage) of capacitor exceed voltage at inverting pin (pin 2), the output of IC become LOW, as a result LED stop to glow. When voltage at capacitor become higher then inverting input pin it start to discharge and again output of IC become high. This high and low output of IC generate square wave and cause LED to blink.
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. Blinking LED1 indicate IC is good.

 

  Joined November 07, 2019      124
Thursday at 04:25 PM

Working of the circuit is simple and straight forward. The IC to be tested is configured in voltage comparator mode. Voltage at pin 3 is fixed where voltage at pin 2 varying due to charging and discharging of capacitor C1.Where battery is connected to the circuit the voltage at pin 3 is high in compare to voltage at pin 2 due to charging of capacitor, as a result output of IC become high and LED start to glow.

At this instant capacitor start to charge through the resistor R4. When charge of capacitor exceed voltage at inverting pin, the output of IC become LOW, as a result LED stop to glow. When voltage at capacitor become higher then inverting input pin it start to discharge and again output of IC become high. This high and low output of IC generate square wave and cause LED to blink.

  Joined February 27, 2020      55
Thursday at 11:08 AM