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Old 20th February 2013, 06:00 AM   #21
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Yes, it does become greater, I checked the centre pin of each transistor. I had no problem pushing the voltage up to 40V+
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Old 20th February 2013, 08:37 AM   #22
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To clarify, the +25 goes to +40 and the -25 goes to -40?
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Old 20th February 2013, 12:44 PM   #23
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Yes, that is correct.
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Old 20th February 2013, 01:19 PM   #24
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What is the resistance between the emitter leg of any output transistor and the positive speaker terminal?
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Old 21st February 2013, 01:02 AM   #25
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Sorry for the late reply.

I get .1ohm.
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Old 21st February 2013, 06:47 AM   #26
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Previously, you stated that the output was distorted and there was about 1v across the speaker terminals. Was the 1v there with a speaker connected or did it drop to 0v?

Was it distorted but very loud?

Did you try it without the limiter, confirming that there was 12v+ across the B+ and ground terminals?
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Old 21st February 2013, 08:40 AM   #27
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Hi Perry, thank you for your help this far.

To answer your question I tried your suggestion.

The distortion is fairly loud, as in louder than the actual music playing. (however in real world application I might not hear it installed) I cautiously powered the amp up tonight with a fuse instead of the limiter, (voltage was 12V at the amplifier power terminals) and the output is the same. Without music playing but source hooked up, I would have to describe the sound as "white noise"

I made a sample video of the output with source playing.
http://www.youtube.com/watch?v=sQ1SH4J5SaI

It should be noted, that the DC output starts around 1.2VDC but slowly drops. for example, tonight it had dropped to about .75 before I disconnected the power supply.
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Old 21st February 2013, 04:34 PM   #28
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I don't understand. How is installing it when it's in the vehicle going to make the audio less distorted/noisy if the noise is louder than the music?

What are you using for a signal source?

Where was the black probe when you measured the DC voltage on the speaker terminals?
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Old 21st February 2013, 04:42 PM   #29
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My apologies, it was quite early in the morning when I wrote that. What I said does not make sense.

When I test for DC voltage I am placing the black probe on the negative speaker terminal.

Is this incorrect?

I am using my Ipod for my source.
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Old 21st February 2013, 07:44 PM   #30
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Using the negative speaker terminal was correct.

??>> I don't understand. How is installing it when it's in the vehicle going to make the audio less distorted/noisy if the noise is louder than the music?
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