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Old 10th February 2002, 09:00 AM   #1
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Cool Preamp

Hello everybody,

I have one question, and problem ...

I've build one preamp based on my oun design.
It consist of one tone control circuit and a volume discrette pot. There is a posibility to swich off the suply and to work in complete passive mode.

So the problem is that there is a hum on one of the chanels, even in passive mode.

I'll be happy if someone can give me an advice about that.

My page is:
www.mfi.uni-sofia.bg/fmi/statist/dimitar
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Old 10th February 2002, 11:25 AM   #2
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Datanasov,

Please check the URL. Browser cannot find it.

Pascal
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Old 10th February 2002, 01:53 PM   #3
tvi is offline tvi  Australia
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<a href="http://www.fmi.uni-sofia.bg/fmi/statist/dimitar/"><b><u>fmi</u></b>.uni-sofia.bg/fmi/statist/dimitar/</a>


James
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Old 10th February 2002, 02:14 PM   #4
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Thanks James.

Pascal
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Old 10th February 2002, 04:14 PM   #5
Helix is offline Helix  United Kingdom
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could you draw a schematic, the pics arn't much to go on.
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Old 11th February 2002, 01:54 PM   #6
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The problem is not in the schematic. I thing that the problems are in wires. The signal grownd is in one point.

The idea is almost the same as the preamp project of Rod Elliot.

Also, there is a hum even in pasive mode, without any cirquits.
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Old 13th February 2002, 10:41 AM   #7
Helix is offline Helix  United Kingdom
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have you followed the rules of only haveing ONE ground point, a star type ground were all the inputs/outputs etc run off. also check all the connectons are being made properly. If you are getting hum in passive mode, this can only be the cause.
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Old 15th February 2002, 11:51 AM   #8
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thanks a lot, I'll check it
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