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Old 25th February 2014, 11:32 AM   #11
ultra is offline ultra  Greece
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Is the board grounded to the chassis?
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Old 25th February 2014, 12:03 PM   #12
Itsme is offline Itsme  United States
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Yes, It was when I tested it.
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Old 25th February 2014, 09:40 PM   #13
laplace is offline laplace  Australia
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That is what I thought, being a mono sub amp with low pass x-over, should not have high frequencies. Should I rewind inductor coil then?
Your problem is noise coming into the amplifier after the crossover. Probably in the power rails.

Do you have a CRO? Looking for HF content on the high voltage power rails will probably be informative. My guess is that the boost converter is having issues.
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Old 26th February 2014, 06:13 AM   #14
Itsme is offline Itsme  United States
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Originally Posted by laplace View Post
Your problem is noise coming into the amplifier after the crossover. Probably in the power rails.

Do you have a CRO? Looking for HF content on the high voltage power rails will probably be informative. My guess is that the boost converter is having issues.
Sorry, Not sure what a CRO is? I do have a 100mhz oscilloscope, just havent learned how to use them fully. If some can tell me what settings and where to put the probes, I will try.
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Old 26th February 2014, 06:16 AM   #15
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CRO = oscilloscope.

This isn't the place to tell you how to use one, but you want to use it to look for any AC signals on the power lines inside the amplifier.
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Old 26th February 2014, 06:22 AM   #16
Itsme is offline Itsme  United States
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ok, I will see what I can figure out with it. Thanks
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Old 26th February 2014, 07:02 AM   #17
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Maybe you can do this,

First probe, put the positive lead of the CRO to +rail with black probe to GND and press the autosetup of the CRO.

Second probe, put the positive lead to speaker output and compare the waveform of the two signals.

Upload the screen shot of your CRO here...
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Old 1st March 2014, 05:04 AM   #18
Itsme is offline Itsme  United States
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Originally Posted by nonprof View Post
Maybe you can do this,

First probe, put the positive lead of the CRO to +rail with black probe to GND and press the autosetup of the CRO.

Second probe, put the positive lead to speaker output and compare the waveform of the two signals.

Upload the screen shot of your CRO here...
Ok, Just replaced my CRO, I had an HP 54501A digital 100mhz that I just couldnt figure out and get it to function the way it should. It's for sale now. lol Anyways here are some pics from the new setup auto measuring high voltage rail on number 1 probe and speaker positive on 2nd probe. Measuring A/C.
Attached Images
File Type: jpg IMG_1417 (1280x960).jpg (697.8 KB, 21 views)
File Type: jpg IMG_1418 (1280x960).jpg (708.6 KB, 20 views)
File Type: jpg IMG_1419 (1280x960).jpg (706.7 KB, 20 views)
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Old 1st March 2014, 11:25 PM   #19
Itsme is offline Itsme  United States
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Here is a sound file of the static noise from this amp. Anybody have any ideas what I should try next?

Well, I tried to upload a zip file of the sound but apparently it wont let me. If anybody can tell me how to upload sound files, I will try again.

Last edited by Itsme; 1st March 2014 at 11:29 PM. Reason: No file attachment
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Old 2nd March 2014, 12:57 AM   #20
laplace is offline laplace  Australia
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Well, you have a serious power supply problem, there's about 10V of crap coming through at ~100kHz. Given the asymmetry of the the waveform, I'm going to guess that the fault is with the latter part of the PSU switcher, i.e. after the switching transformer. I could be totally wrong here, but have a look for shorts (due to gunk from the exploded caps) and bad/open/shorted components (diodes, capacitors) in the rectifier+filter stages of the PSU.
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