alphasonik pma1200dai have this amp i just got.i haven't worked on one of these doesn

timwebb · 12th March 2010, 02:43 AM

i have this amp it keeps blowing caps in the output part i think its the mosfets,its going to be a pain to take these clamps off.it comes on fine with the caps off its a blown mosfet i think. weird amp dosent even have fuses.

ontoaba · 12th March 2010, 06:32 AM

Wrong design, The caps couldn't handle the current ripple. The ripple should reduced with more inductive line.
It need to use better or bigger caps or more inductive in the line. If these caps used as supply, it can be replaced with larger farads, but if as output filter, replace with SH caps (motor starting) or MKP caps.

jjacks4x · 12th March 2010, 06:36 AM

caps do that when they see high ripple current, replace with higher voltage. Check the diodes make sure they are good. if the caps are in the pre ac section , on the dc side of the switching supply, add a big cap on the 12 supply.
it is hard to tell where they are from the pic.

timwebb · 12th March 2010, 09:27 PM

hers the pic

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12th March 2010, 06:32 AM	#2
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	Wrong design, The caps couldn't handle the current ripple. The ripple should reduced with more inductive line. It need to use better or bigger caps or more inductive in the line. If these caps used as supply, it can be replaced with larger farads, but if as output filter, replace with SH caps (motor starting) or MKP caps.

12th March 2010, 06:36 AM	#3
jjacks4x diyAudio Member Join Date: Oct 2002 Location: san jose	caps do that when they see high ripple current, replace with higher voltage. Check the diodes make sure they are good. if the caps are in the pre ac section , on the dc side of the switching supply, add a big cap on the 12 supply. it is hard to tell where they are from the pic.

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