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-   -   Broke my Chip amp (http://www.diyaudio.com/forums/chip-amps/95845-broke-my-chip-amp.html)

pjpoes 6th February 2007 08:07 PM

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.

Nordic 6th February 2007 09:25 PM

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?

pjpoes 6th February 2007 11:43 PM

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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