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Old 18th February 2004, 08:51 PM   #1
gasjack is offline gasjack  Denmark
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Default Loud hum problem

Hi.

I have built a six-channel amp using the 3886 chips. I built it using PCBs from http://www.audioworkshop.com.hk/order/order.htm

Untill yesterday it worked just fine. However, there was a slight hum on the channels closest to the power supply, so I had the case open and was trying to rearrange the wires to minimize the humming. Suddenly a spark came from one of the PCBs, and it started humming much louder.

I have tried resoldering all the grounding joints but to no avail. I am not sure, but I think the spark might have come from one of the joints where the caps are soldered to the PCB. Could it be a faulty cap perhaps? (the amp still works despite the hum though)

Any suggestions?

Rasmus
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Old 18th February 2004, 08:59 PM   #2
AGGEMAM is offline AGGEMAM  Denmark
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I think you're right in that it being a faulty cap. Try taking them out and test them.
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Old 18th February 2004, 09:33 PM   #3
gasjack is offline gasjack  Denmark
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Quote:
Originally posted by AGGEMAM
I think you're right in that it being a faulty cap. Try taking them out and test them.
Even though the amps still plays?

Well I tried testing the caps using this technique http://www.101science.com/101captesting.htm but they seemed to be OK.

If anyone knows of another way to test them please let me know.
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Old 18th February 2004, 10:55 PM   #4
gasjack is offline gasjack  Denmark
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I tried this method too. And the filter caps seem to be alright.
It should be noted, that the amp plays fine except for the loud hum (at least it did before i desoldered the caps).

Is this an indicator of a grounding problem? If so I am puzzled, since it used to work, and I have resoldered all the gorund connections.

Any suggestions?
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Old 19th February 2004, 12:16 PM   #5
gasjack is offline gasjack  Denmark
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Quote:
Originally posted by gasjack
I tried this method too.
When I say this method I mean the ones mentioned on this site:
http://www.dumall.com/en/manuals/ele...ts/index.shtml
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