I'm working on building the PCB for a circuit that I have already breadboarded successfully. Part of it is a high voltage power supply, which has a MOSFET in it. Unlike the breadboarded version, the MOSFET on the PCB is making a high pitched noise which changes pitch if anything touches the heat sink mount as well as getting rather hot. Does anyone know what could be causing this? I have tried switching out the transistors, 555 timer, and inductor to no avail.
The power supply seems to be putting out the correct voltage, however, when I'm measuring it, my multimeter was occasionally switching to VAC for some reason. It isn't doing that anymore at the moment though.
Any help would be greatly appreciated.
The power supply seems to be putting out the correct voltage, however, when I'm measuring it, my multimeter was occasionally switching to VAC for some reason. It isn't doing that anymore at the moment though.
Any help would be greatly appreciated.