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Old 9th August 2013, 07:46 PM   #21
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Yes.
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Old 9th August 2013, 10:03 PM   #22
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Do you have audio on both contacts (stationary and movable) of the relay?
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Old 9th August 2013, 11:49 PM   #23
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I have tested that there is continuity through the relay when it is energized.
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Old 10th August 2013, 12:52 AM   #24
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If there is audio on the output transistors, confirm that that audio is reaching the relay. If it is and the relay has continuity, you should have audio on the positive speaker terminal. If you have audio on the positive speaker terminal, either the speaker/wiring is open or you have a bad ground for the negative speaker terminal.

You can probably find a 1N914 or 1N4148 diode at the local radio shack if you're in the US.
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Old 12th August 2013, 03:36 PM   #25
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I have audio all the way to the terminals.. but hooking up a speaker, it is too "low" to hear anything.
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Old 12th August 2013, 07:36 PM   #26
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If you drive a sine wave into the amp and measure the voltage with and without a speaker load, does the voltage on the terminals change?
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Old 17th August 2013, 01:45 PM   #27
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If I hook speakers up to it, I can hear the audio, but it is very low. If I increase the level of the input it reaches a point where like someone flipped a switch, and it starts working as I would expect it to (but, it sounds distorted- possibly because the input is so loud).

Still thinking something in the feedback loop, and open to suggestions!

Thanks.
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Old 20th August 2013, 01:26 AM   #28
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That doesn't answer the question.
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Old 20th August 2013, 11:26 PM   #29
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No, amplitude on the scope does not change with load/no load...

But on my test bench the amplifier seems to be working properly now?? I have not done anything to it since I posted on the 17th... I will install it back in the car and see what happens..
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Old 20th August 2013, 11:45 PM   #30
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Sorry, I was mistaken.. I still hear audio from the speaker (low), until I increase the input to the point of distortion.

But.. I see no change in amplitude when the speaker is connected/disconnected.
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