Capasitive start and run.?
I have build this circuit and works great for a 12v pc fan on the bench for PWM. When i hooked this into my ATX power supply to regulate the fan speed the fan doesn't like to run unless i touch some portion of the pcb i build the circuit on. I spliced the wires from the ATX power supply into the PWM circuit, then out of the PWM circuit back to the fan. I guess its a capactive issue.
What could be the fix for this?
The other An EE suggested i add several diodes inline to slow the fan down....hhmm maybe