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Having separate grounds is pretty common in audio, one is a clean 0v reference for audio circuitry, PE is the chassis ground, and there is also a dirty digital/relay ground not shown; this is to reduce common impedance coupling. They all join together at the PSU, and I have checked there is no...
Hi Klaus, thanks for your suggestions, I have answered your questions below:
No, the main point of the poly cap is to stop the opamp's bias current going through the relay, so putting the cap before the relay would negate this effect. Also as there are actually 5 seperate relay inputs, this...
Hey,
I am using the circuit shown below, just a basic input select (there are multiple inputs, only one shown) and then an noninverting opamp. I have a problem that there is some DC (50-200mV - it varies) on the trace marked as INPUT_BUS, causes pops when the input relay is switched. The DC...
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