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Old 5th January 2011, 01:48 AM   #1
spooney is offline spooney  United States
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Default Audiopipe AP15001D . In need of an inductor

I received this amp today and so far I have been unable to find any shorted power supply or output fets. Amp looks fairly pristine inside minus the output inductor which appears to have shorted. I need to either replace or rewind the one I have. Where might I be able to source the wire to rewind the old inductor? It doesn't look like a major short but it is deep enough inside that I'd rather repair or replace it than try to fix the short and hope it last. For the time being I have removed the inductor from the amplifier. Is it safe to power the amp up without the inductor to check for other faults? Is it possible to drive signal into it to see if it plays audio? I imagine it would be noisy without the inductor. What are the odds that the inductor shorted and there are no other faults? I have never rewound one of these before. Does anyone know if there is a section in Perry's tutorial that covers this?
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Old 5th January 2011, 02:37 AM   #2
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I don't know if the feedback is taken before or after the inductor in this amp. If it's taken before the inductor, it should power up normally and the output stage should oscillate but you won't see anything that looks like audio. You could look at the square wave on the outputs. The audio signal would modulate the square wave if everything else is OK.

If you want to make a new inductor, you can get the cores from CWSBytemark. If you post a photo of the inductor, I'll try to help you find the replacement core.
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Old 5th January 2011, 02:53 AM   #3
spooney is offline spooney  United States
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I'm going to see if audiopipe might sell me one thats ready to go. If not I think I am going to try to rewind this one. It looks like it shorted due to vibration. It was pretty loose on the board. Next chance I get I will try to power the amp up to see if there are any other issues.
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Old 5th January 2011, 03:43 AM   #4
spooney is offline spooney  United States
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Amp powered up fine without the inductor. Where on the outputs might I find the square wave? I think I had found it but I would like to make sure I am looking in the right spot. I'd like to take a pic of the waveform to verify the amp is ok other than the inductor .
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Old 5th January 2011, 03:46 AM   #5
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The input terminal of the inductor should have the rail to rail square wave.
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Old 5th January 2011, 03:48 AM   #6
spooney is offline spooney  United States
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I will have to check that after work tomorrow. Thanks Perry. I will get a pic of that inductor as well.
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Old 6th January 2011, 01:26 AM   #7
spooney is offline spooney  United States
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Here is a pic of the waveform at the input of the inductor :

Click the image to open in full size.


And here are a couple pics of the inductor :

Click the image to open in full size.

Click the image to open in full size.
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Old 6th January 2011, 02:42 AM   #8
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Did audiopipe get back with you?
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Old 6th January 2011, 03:12 AM   #9
spooney is offline spooney  United States
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No I didn't hear from them today. I am going to try to call them tomorrow. Does that waveform look normal?
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Old 6th January 2011, 03:21 AM   #10
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The waveform looks. I'm assuming that the vertical amp was set to 50v/div and the timebase was set to approximately 5uS.
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