- Joined Apr 2, 2015
All parts of your circuit should have a "return path to ground". The node between the capacitor and Op amp is trapped. You will likely get some amplification when you turn it on and it will get quiet in a few seconds (time lag will depend on teh value of the cap, the input impedance of the Op Amp and the insulation of the circuit board. Depending on your input signal impendance and cap value will determine the best resistor size, but you can start with a 1M ohm resistor from non-inverting op amp input to ground should help (assuming you have a dual power supply). If you have a single supply, a 1 M resistor to a virtual ground (reference voltage) is needed.Could you explain why it will remove the DC offset? A capacitor with one lead floating will have the same potential on both plates, will it not?
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