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Chip Amps Amplifiers based on integrated circuits

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Old 20th November 2012, 04:19 PM   #11
johnr66 is offline johnr66  United States
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Join Date: Mar 2009
Where does the green wire go on the supply in? I see only two wires off the transformer's secondary. Unless it is out of the picture, the green wire must be connected to the center tap on the transformer's secondary.

use a 40 watt bulb tester when setting this thing up.
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Old 20th November 2012, 04:47 PM   #12
prezden is offline prezden  Canada
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I connected the on board pot and inputs. Still humming away with no sound (music) This is most confusing
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Old 20th November 2012, 08:29 PM   #13
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Join Date: Oct 2012
Originally Posted by prezden View Post
Could the damaged cap cause the hum?
yes. it is possibly shorting out whatever is connected to it.
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Old 23rd November 2012, 07:49 PM   #14
prezden is offline prezden  Canada
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Part 2: I replaced all the caps and have had 50% success. One channel is working quite well. There is a very slight hum. The other channel has no audio and a loud hum. I have narrowed the problem down somewhat. By removing one of the caps (C8) the hum is gone but there is no audio. I have tried 2 caps at this location with the same result.
I'm stumped
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Old 24th November 2012, 06:17 AM   #15
prezden is offline prezden  Canada
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Hello again- I replaced the c8 it still hums. By bridging between c8 and the output gnd the hum completely stops but there is still no audio. It's a shame because the other side sounds pretty decent.
Any ideas?
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Old 24th November 2012, 07:49 AM   #16
Jay is offline Jay  Indonesia
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Location: Jakarta
Looks like a bridge amp PCB??
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