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Old 21st July 2003, 06:12 AM   #1
cowanrg is offline cowanrg  United States
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Default problem with gainclone

i just got my boards in for my gainclone project, and i threw one together, and i measured the voltage and got 35V. this seems really high. im using a 24V transformer.

i an unable to get it to play anything at the moment either. it can hum, but thats it. no music comes though it. any ideas anyone? im using peter's schematic, and i have gotten two of these to work previously, but since then, i have built 3, and none of them work? are the transformers too high of voltage?
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Old 21st July 2003, 06:28 AM   #2
Mad_K is offline Mad_K  Norway
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what chip are you using? check, double check and check again the parts and the connections....
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Old 21st July 2003, 06:39 AM   #3
cowanrg is offline cowanrg  United States
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lm3875.

its such a simple design, its almost impossible to mess up! could someone explain to me (like i was an idiot), how you wire up the power? from the wall to the board (or chip)? im using a bridge rectifier now.
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Old 21st July 2003, 09:38 AM   #4
Nuuk is offline Nuuk  United Kingdom
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Cowanrg - are you using a transformer with 24V secondaries? If so your rail voltage will be around 35V! (Secondary voltage X 1.414)

As regards wiring up the PSU, take a look at my GC FAQ page .
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Old 22nd July 2003, 07:32 PM   #5
ukram is offline ukram  Finland
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A power supply picture from finnish LM3886 project:

Click the image to open in full size.
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Old 22nd July 2003, 07:49 PM   #6
cowanrg is offline cowanrg  United States
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i figured it out. i didnt notice that the board had to be grounded as well. i connected the board to the star ground, and all worked fine. thanks everyone.
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Old 25th August 2003, 07:14 AM   #7
Llamas is offline Llamas  United States
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I'm trying to track down a hum in my new project. Can you clarify what you mean by grounding the board?
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