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Mosfet noise - Clicking and Screetching
I have a custom power supply that has an input rating of 120vac and an=20
ouput rating of 24vdc @ 6amps (apx 140watts working). The main switching=20 MOSFET is making an audible noise... clicking when first turned on and=20 then it screetches and voltage drops to 0 then clicking and slowly back=20 up to 24=B1 vdc then screetching and back down to 0. What could be causing= =20 this? - could this be a bad rectifier in the AC/DC wave form conversion=20 or do you think it could be a bad capacitor that is leaving the circuit=20 out of ballance... I have tested everything and it seems to check out.=20 All resistors are within spec. MOSFET has been replaced (no change). The=20 capacitors under 100uf test out ok (I have no way to test the 2 caps=20 that are 200v 330uf). Thanks, kj |