Buzz diminishing with raised volume?

Garlando · 29th November 2011, 05:26 PM

I'm looking for some suggestions in dealing with a new problem with my system. I recently added a new higher VA power transformer for my McCormack Micro line drive preamp. It has added a good amount of dynamics to the sound but also has caused an annoying buzz through the speakers (I'm guessing it is around 120 hz) which decreases when I turn the volume pots up. With the preamp disconnected there is no buzz. When I replace the new transformer with the original wall wart the buzz is still present. The no load voltage from both transformers is nearly identical at 24V. The rest of the system consists of Cambridge Audio cdp, EAD dac, Helder tk250 monoblock boards and Pi 4 DIY loudspeakers.
I'm thinking the clue to the problem may lie in the buzz going away at full volume (wiith no music playing).

Any ideas?

Thanks!

Garland Branch

mjf · 29th November 2011, 07:24 PM

hello.
perhaps you have a bad soldering point/ground connection on your volume pot.

DF96 · 29th November 2011, 09:45 PM

Sounds like the buzz is on your ground. You may have wired the new transformer in a way which injects charging pulses into the ground.

29th November 2011, 05:26 PM	#1
Garlando diyAudio Member Join Date: Dec 2008	Buzz diminishing with raised volume? I'm looking for some suggestions in dealing with a new problem with my system. I recently added a new higher VA power transformer for my McCormack Micro line drive preamp. It has added a good amount of dynamics to the sound but also has caused an annoying buzz through the speakers (I'm guessing it is around 120 hz) which decreases when I turn the volume pots up. With the preamp disconnected there is no buzz. When I replace the new transformer with the original wall wart the buzz is still present. The no load voltage from both transformers is nearly identical at 24V. The rest of the system consists of Cambridge Audio cdp, EAD dac, Helder tk250 monoblock boards and Pi 4 DIY loudspeakers. I'm thinking the clue to the problem may lie in the buzz going away at full volume (wiith no music playing). Any ideas? Thanks! Garland Branch

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29th November 2011, 07:24 PM	#2
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. perhaps you have a bad soldering point/ground connection on your volume pot.

29th November 2011, 09:45 PM	#3
DF96 diyAudio Member Join Date: May 2007	Sounds like the buzz is on your ground. You may have wired the new transformer in a way which injects charging pulses into the ground.

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