![]() ![]() The problem may not be the cap, it could be that your circuit is oscillating.ġ000x gain with a single opamp stage is ambitious. When firmly holding the USB cable the offset was about the same as without the cap.ĭo you have any idea why adding the cap changes the circuit in this way? The measured values were more noisy, offset voltage was higher and it was much more sensitive to "touch" - the closer my hand was to the wires (or to USB cable powering Arduino from laptop connected to mains) the lower was offset voltage. But with the cap the results were worse than without it. I wanted to stabilize the voltage by C1 - 100n ceramic cap to "smooth" potential noise from sampling by the Arduino. Common mode voltage was created by 3k3 pot. ![]() ![]() Difference should be about 1000 times more than input offset. By my Arduino "oscilloscope" I measured voltage on the + input and the output. ![]()
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