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Op Amps

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Fitzy_89

New Member
Hi i have an electronics exam tommorrw and i was just wondering how would i calculate the output voltage of a circuit

E.G

Vin=0.8V
Rf=330kohms
Rin=82kohms

Any help would be greatly appreciated
 

audioguru

Well-Known Member
Most Helpful Member
I guess your opamp circuit is inverting.
Then 50 million tutorials on the web say that the voltage gain at DC and low frequencies is 330k/82k= 4.024490243. Then the output voltage is 3.33V.

But the input offset voltage of the opamp will vary the output voltage a little.

Didn't your teacher teach you this??
 

BrownOut

Banned
This is incorrect. If the amplifier is inverting, then the output is -Rf/Rin. Thus the output is -3.22V. The sign is crucial, either on an exam or in real circuits.
 
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