MTX RT251D Getting 40V across speaker terminal

turbosundance · 29th May 2006, 04:29 PM

I have a MTXRT251D at home that I got off ebay a while back. It hooked it up to a cheap woofer when I got it and when I turned it on it promply cooked the voice coil in the woofer. I put a meter across the speaker terminals and I got 40VDC. The are no visibly bad chips inside the amp. Where should I start on this one. I'm used to working much less congested amps, I've never touched a class D ap before though. This is a mono amp.

Tekko · 29th May 2006, 04:48 PM

The output fets are most likely blown, but it could also be busted gate drivers or something else that makes the fets get turned on constantly.

Unfortunately there is not mutch you can do without a scope.

turbosundance · 16th October 2006, 03:56 PM

Can a PC soundcard scope be used to test this? I've heard a bit about using a soundcard as a scope but I dont know much about it. Is there a place to get more info?

fredos · 17th October 2006, 06:56 PM

If you do that, dont forget to pad with resistor the input of your sound card...And lift the ground of your amplifier to avoid power short to your computer...And last but most important..Do it with old not used computer!

Fredos

www.d-amp.com

29th May 2006, 04:29 PM	#1
turbosundance diyAudio Member Join Date: May 2006	MTX RT251D Getting 40V across speaker terminal I have a MTXRT251D at home that I got off ebay a while back. It hooked it up to a cheap woofer when I got it and when I turned it on it promply cooked the voice coil in the woofer. I put a meter across the speaker terminals and I got 40VDC. The are no visibly bad chips inside the amp. Where should I start on this one. I'm used to working much less congested amps, I've never touched a class D ap before though. This is a mono amp.

29th May 2006, 04:48 PM	#2
Tekko diyAudio Member Join Date: Jan 2005	The output fets are most likely blown, but it could also be busted gate drivers or something else that makes the fets get turned on constantly. Unfortunately there is not mutch you can do without a scope. __________________ The point of life is to build atleast one audio amplifier before you die.

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16th October 2006, 03:56 PM	#3
turbosundance diyAudio Member Join Date: May 2006	Can a PC soundcard scope be used to test this? I've heard a bit about using a soundcard as a scope but I dont know much about it. Is there a place to get more info?

17th October 2006, 06:56 PM	#4
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	If you do that, dont forget to pad with resistor the input of your sound card...And lift the ground of your amplifier to avoid power short to your computer...And last but most important..Do it with old not used computer! Fredos www.d-amp.com

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