# “Amplified” op amp and associated gain

I want to have a higher current output than most op amps (2A) and found the schematic below. But I want to control the output voltage. Could I use a divider circuit with two resistors in the feedback loop to do that? • What do you mean by "control the output voltage"? This circuit controls the output voltage, so how do you want it to be different? Please draw a schematic of how you want to add a voltage divider. – Elliot Alderson Sep 20 '18 at 21:15
• Do you mean a pair of resistors like $R_1$ and $R_2$ in the circuit in this question (to provide amplification instead of merely buffering the input voltage)? – Null Sep 20 '18 at 21:18

## 1 Answer

You are controlling the voltage. You're controlling it to be the same as the input voltage over the range of about +/-4.3V.

If you want the full +/-5V range, you'll have to run the op amp from slightly higher rails due to the B-E drop.

If you want the output lower than the input, put a voltage divider to ground between the input signal and the positive input of the op amp.

If you want the output higher than the input, put a voltage divider to ground between the output and the negative input of the op amp.

If none of these guesses correspond to what you want, you'll have to clarify further.