Finished Car Amplifier schematic + PCB based on Kenwood KAC-716 - Page 11 - diyAudio
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Old 15th February 2008, 01:29 AM   #101
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When halfway thru turning up the gain, the amp suddenly burst into life!

I found the problem in the end, the signal ground on the RCA socket on the amp has an intermittent connection...

This explains why I was able to trace a signal thru the whole circuit, as my black probe was clipped on to the outside of the RCA... So my meter was getting a great ground, but the amp wasn't...

Anyway, I've soldered a wire from the RCA ground to correct end of R80, and it is all working! I can't believe that I checked the rca plugs when the board was out the chassis, and they checked out ok... Next time i'll check, double and triple check the RCA's...

I guess you could even croc clip signal wires onto components on the PCB to bypass the RCA's altogether...

I just want to say thanks, this is the first time I've fixed an amp, and I doubt I would have managed it without your help.
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Old 15th February 2008, 01:09 PM   #102
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Now that it's working, you should trace the signal through the amp so you'll know what to expect on other amps.

When I suggested that you increase the signal level, it was because the signal levels weren't correct. It appeared that you may have been picking up noise more than anything else. You should have found a signal almost 20x greater on the emitter of Q112 than on the base of Q101.
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Old 21st February 2008, 09:53 PM   #103
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Ok, I'll have another go at tracing the signal thru the circuit to see how it all works. It's really helpful having the schematic (and pcb layout), but I guess this won't always be the case with other amps.
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Old 23rd March 2009, 07:17 PM   #104
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Default kenwood kac718

Hi, all! I am new here. I am intrested about detailed information for input inductor for kenwood kac718
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Old 24th March 2009, 08:18 AM   #105
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Default My Finished Car Amp

Hi Friends,

My Finished car amp pics
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Old 24th March 2009, 08:20 AM   #106
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Pics
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Old 24th March 2009, 08:23 AM   #107
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more view..
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Old 24th March 2009, 08:27 AM   #108
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Oooo.....
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Old 24th March 2009, 09:47 AM   #109
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now this really looks like car amp, very nice design you have there!
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Old 24th March 2009, 01:29 PM   #110
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Audi-

That looks really sweet. Two things: 1) Noticed you're using chip-amps. Might those be LM4765T Overature-series amps? ((Or am I just too lazy to look back thru the thread to see if you listed it earlier? ) If so, how are you running them? Bridged output?; and 2) I have a couple heatsinks that look just like the ones you're using. Now I have a good idea of what to do with them...

Keep up the great work!!

Cheers,

Steve
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