Audiopipe AP15001D . In need of an inductor

spooney · 5th January 2011, 01:48 AM

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?

Perry Babin · 5th January 2011, 02:37 AM

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.

spooney · 5th January 2011, 02:53 AM

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.

spooney · 5th January 2011, 03:43 AM

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 .

Perry Babin · 5th January 2011, 03:46 AM

The input terminal of the inductor should have the rail to rail square wave.

spooney · 5th January 2011, 03:48 AM

I will have to check that after work tomorrow. Thanks Perry. I will get a pic of that inductor as well.

spooney · 6th January 2011, 01:26 AM

Here is a pic of the waveform at the input of the inductor :

And here are a couple pics of the inductor :

Perry Babin · 6th January 2011, 02:42 AM

Did audiopipe get back with you?

spooney · 6th January 2011, 03:12 AM

No I didn't hear from them today. I am going to try to call them tomorrow. Does that waveform look normal?

Perry Babin · 6th January 2011, 03:21 AM

The waveform looks. I'm assuming that the vertical amp was set to 50v/div and the timebase was set to approximately 5uS.

5th January 2011, 01:48 AM	#1
spooney diyAudio Member Join Date: Dec 2006	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?

5th January 2011, 02:37 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th January 2011, 03:46 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The input terminal of the inductor should have the rail to rail square wave. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

6th January 2011, 02:42 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did audiopipe get back with you? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

6th January 2011, 03:21 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The waveform looks. I'm assuming that the vertical amp was set to 50v/div and the timebase was set to approximately 5uS. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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5th January 2011, 02:53 AM	#3
spooney diyAudio Member Join Date: Dec 2006	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.

5th January 2011, 03:43 AM	#4
spooney diyAudio Member Join Date: Dec 2006	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 .

5th January 2011, 03:48 AM	#6
spooney diyAudio Member Join Date: Dec 2006	I will have to check that after work tomorrow. Thanks Perry. I will get a pic of that inductor as well.

6th January 2011, 01:26 AM	#7
spooney diyAudio Member Join Date: Dec 2006	Here is a pic of the waveform at the input of the inductor : And here are a couple pics of the inductor :

6th January 2011, 03:12 AM	#9
spooney diyAudio Member Join Date: Dec 2006	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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