operational amplifiers amplification level

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Tracid

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i would have one more question.
i got a connection like this one. i need the formula to get the Au(amplification level) of the amplifier.
does it change something in formula if i change the input polarities?

and could you give me some links where similar connections are explained?

Thank you very much again!
 

that circuit is a non-inverting amplifier, and the amplification formula,
A = (R1+R2)/R1

if you change the input polarity (inverting amplifier), the formula will be
A = Rf/Rin
but the circuit will be different.
 

So theres nothing to calculate with voltages? thanks very much!
 

This is a non-inverting amplifier having a gain of
A=(1+R2/R1)
if u change the polarity then this becomes a Inverting amplifier with a gain of
A= -R2/R1 -ve sign indicates the phase difference of 180 degree between input and output.
Keep in mind that change polarity such as feedback ramains negative if u will give feedback on +ve terminal then it behaves as a comparartor.
 

Ashish.chip : i hope you missed an ´R´ at your equation, because you wrote A= (1+R2/R1) and not (R1+R2)/R1. but thanks!
 

Ashish.chip is correct.

Non-inverting gain = (1+R2/R1)

Regards,

Pld4me
 

Tracid said:
Ashish.chip : i hope you missed an ´R´ at your equation, because you wrote A= (1+R2/R1) and not (R1+R2)/R1. but thanks!
Click to expand...

He was right.

(R1 + R2)/R1 = 1+R2/R1
 

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