I hope this is OK to ask here as it isn't exclusively a mic question but a general electronic question that might be applicable to some mics.
Consider a fet input with a high impedance, that is connected to a exposed bare wire or RCA type plug, because it needs to be unplugged from the source.
This could be for a piezo pickup with an input impedance of 5-10M or it could be for a condenser mic with an impedance of 1G
Do I need to protect that bare fet gate from ESD it might encounter in the world?
here's a schem to illustrate:
I have naively added diodes but I'm not sure if they will actually lower the input impedance which obv I don't want. The real-life behaviour of diodes at high impedances is beyond my current level of understanding.
I'm also not sure if 1N4148 are big enough to offer much protection.
Nor am I sure if R1 offers any protection.
Could any of the experts here talk me through what would be wrong with the attempts at ESD protection in this schematic?
