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Old 6th February 2007, 07:07 PM   #1
pjpoes is offline pjpoes  United States
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Default Broke my Chip amp

Sorry for the stupid post, I'm quite suprised I did this. I put my chip amp on the shelf for a while because of some problems that needed replacement parts, and a new chassis. Today I decided to get it up and running, and changed a bunch of the wire, etc. I put quick connects on my power wires, and accidentally wired up one of the amps PG- and V- wrong, I reversed them. Now every time I turn the amp on I get a buzzing sound, very intense, and when I first did it, I'm quite sure I heard a pop from the power supply board. My guess is I shorted out a diode and need to replace it. Does that sound correct? Any chance I blew the capacitors, I tested the small bypass caps on the board and they all measure correctly. However, I haven't tried the larger amp caps, which I should probably try next. Thanks in advance, and sorry to bother you with such a silly problem.
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Old 6th February 2007, 08:25 PM   #2
Nordic is offline Nordic  South Africa
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easy way to tell, remove all the caps.... it will still work, if nothing else is broken... chips may have blown too... have you measured the DC on outputs now?
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Old 6th February 2007, 10:43 PM   #3
pjpoes is offline pjpoes  United States
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Yeah thanks nordic, I fixed it. Two of the Diodes were no good, so I replaced them with some Ixys I had laying around. I then replaced two of the caps on that board, the main caps were fine. I also installed a fuse and powerswitch. I know it should have had it all along, but I was testing and just wanted to throw it together. That was kinda stupid as it took an extra two seconds to add a fuse. It's all good now though.

Still have some residual hum, but it has always had that. Its way down in level, and I think the DC offset is high, which might be part of the problem. Not really important, its being used to power my rear speakers in a surround setup, so I'm not overly concerned.
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