Hello. I use an OpAmp LM324 as follower behind a voltage divider connected to a high voltage in the 8 kV. That works, but in some cases a spark can occur between this HV and ground and in that case systematically the LM324 is destroyed (distance between spark place and AmpOp is about 4" and ground line is common). Is there a good protection to avoid this risk ? For instance a Zener diode parallelized with the OpAmp input line ?