Have a PIC circuit that outputs a square wave that is upwards of 22khz.
It works but when I place a finger near the board it quits outputting.
The output of the PIC is connected to an LM386.
Have built same w/o any problems.
With project completely assembled, just placing hand near the enclosure causes it to shut off.
Thinking THERMIN PRINCIPLE?
Perhaps a bad decoupling cap as I have several on the board or perhaps 7805 output cap?
any suggestions.
Just picking up one end of assembled case causes it to shut off. YES I checked all connections. Just placing a finger over the board causes havoc.
Going to solder an additional cap on the supply rails.