Resistors burned up on Tripath 2022 kit - diyAudio
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Old 3rd August 2009, 08:27 PM   #1
ozerik is offline ozerik  United States
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Default Resistors burned up on Tripath 2022 kit

This is my second attempt at a Tripath chip kit from The first one burned up a diode, and my closest scrutiny couldn't find my error. This one is an AMP1 kit, with a lot fewer SMD components, so I thought i'd have more luck.

But it smoked. I think my power supply is why. I built the PS with two 24V transformers, smoothed by 10,000uF caps... but didn't realize that my final no-load voltage would exceed the 35V "absolute maximum" voltage. The no-load voltage was 37V from both transformers. Well... +37 0 -37.

I think i traced the source of smoke to those two resistors. WHY??? Grrrrr. And is my whole kit toast?

Yeah, i used the light bulb protector thing recommended here.

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Old 3rd August 2009, 11:19 PM   #2
star882 is offline star882  United States
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Replace the resistors and check for proper operation.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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