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Old 25th November 2012, 10:57 AM   #1
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Default Annoying buzz!

I have had my 4780 kit up and running for 2 years, maybe even 3 now!

Its working great and sounds great too..... However for some strange reason every now n then it will give out a loud annoying buzz... Its a deep bass hum but not real bassie... It remains at the same volume no matter where my volume pot is positioned and it can be clearly heard over anything playing.

I have looked over the boards and cannot find any loose or unsoldered parts or wires, and all my grounding seems solid and secure via a nut and bolt with a star washer.

Not sure if i should strip it all down from enclosure and rebuild or if there may be an easier explanation... Anyone else had this and got a clue on how to solve it.

LM4780 from Audiosector, 300VA 2 x 22 volt toriod, outputting into 120 watt RMS JVC 8ohm speakers. When it works it works well.
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Old 25th November 2012, 11:10 AM   #2
AndrewT is offline AndrewT  Scotland
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grounding error or DC through the transformer.
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Old 25th November 2012, 11:12 AM   #3
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Grounding I can check over... how do I test for DC in Transformer?
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Old 25th November 2012, 11:40 AM   #4
AndrewT is offline AndrewT  Scotland
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add a DC blocker.

There are many Threads discussing this problem and many solutions.
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Old 25th November 2012, 11:52 AM   #5
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Thanks Andrew... On a quick glance of DC blocking, I can only hope its a dodgy earth!
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