Thread: Op amp gain
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Sep4-11, 04:43 PM
P: 1,822
If your output becomes zero after a few seconds then perhaps your 4.5 V bias is the problem. Can you check pin 3 on both op amps and see if they have 4.5 V on them? I suspect your circuit isn't wired exactly like the diagram.

Once you are able to get a constant 4.5 V at the output of each op amp, why don't you try a gain of 15 instead of 150 and see what happens?