Resistors burned up on Tripath 2022 kit

ozerik · 3rd August 2009, 08:27 PM

This is my second attempt at a Tripath chip kit from 41hz.com. 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.

star882 · 3rd August 2009, 11:19 PM

Replace the resistors and check for proper operation.

3rd August 2009, 08:27 PM	#1
ozerik diyAudio Member Join Date: Aug 2009	Resistors burned up on Tripath 2022 kit This is my second attempt at a Tripath chip kit from 41hz.com. 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.

3rd August 2009, 11:19 PM	#2
star882 diyAudio Member Join Date: Mar 2007	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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