Type of op-amp

[sM1101011]

I need help identifying this op-amp. I was told it is a 'follower' with a gain of 1 but i think it is an inverting op-amp.

The output should equal to 3V [simulated value]

The problem is the inverting formula Vout = (-Rf/R1)(Vin) does not give an output voltage of 3V. Can someone please say if this is a follower op-amp and if so why.

Any calculation will be very much accepted.

 

[Roff]

The circuit has net positive feedback, so the output will go to the positive rail and stay there.

 

[sM1101011]

The circuit has net positive feedback, so the output will go to the positive rail and stay there.

Inverting of follower

 

[Roff]

Inverting of follower

Neither. It is not an amplifier, inverting or noninverting. As I said,

The circuit has net positive feedback, so the output will go to the positive rail and stay there.

Where did you get this circuit?

 

[sM1101011]

This is the original circuit

Can you explain in more detail please

 

[Roff]

This is the original circuit

Can you explain in more detail please

It's an inverting amplifier with a gain of 50. I've corrected your schematic. See the attachment.

 

[sM1101011]

How do i obtain the the output voltage of 3 volts [simulated voltage]

If i use 50 as the gain the output voltage will be 150V

 

[Roff]

How do i obtain the the output voltage of 3 volts [simulated voltage]

If i use 50 as the gain the output voltage will be 150V

The DC output voltage is 3V. The AC output voltage is 50 times the output voltage of the microphone, so the if microphone output voltage is more than approximately 100mV p-p, the op amp output will be clipped, due to saturation (50*100mV=5V, the power supply is 6V).

 

[sM1101011]

Thank you very much Roff