Multiple op amps with single split supply?

BobTPH

Joined Jun 5, 2013
8,813
You need to use the 4'th op amp to buffer your virtual ground. The way you have it now, any current into or out of the virtual ground is going to play havoc with it.

Put the two 100K resistors to the + input, connect the output to the - input, and the output is the new virtual ground.

Bob
 
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