buzzing power supply

keyser · 9th March 2005, 08:42 AM

Hi!
the power supply of my poweramp makes a buzzing sound when I turn it on (guess it's about 50 hz, the mains frequencie here in (most of) Europe). It lasts for only a few seconds, and after that it's only audible when I push my ear against the amp's case. This buzzing isn't really disturbing me, but I'm just curious what might cause it, and if it is harmful for the amp in any way.
keyser

Frank Berry · 9th March 2005, 08:51 AM

It's probably the transformer laminations that are buzzing.
Since it lasts for only a short period when power is applied, I'm guessing that the tranny is delivering lots of current while it's charging the electrolytic power supply capacitors. Probably nothing to worry about.

9th March 2005, 08:42 AM	#1
keyser diyAudio Member Join Date: Oct 2004 Location: The Netherlands	buzzing power supply Hi! the power supply of my poweramp makes a buzzing sound when I turn it on (guess it's about 50 hz, the mains frequencie here in (most of) Europe). It lasts for only a few seconds, and after that it's only audible when I push my ear against the amp's case. This buzzing isn't really disturbing me, but I'm just curious what might cause it, and if it is harmful for the amp in any way. keyser __________________ "Convictions are more dangerous enemies of truth than lies" - Friedrich Nietzsche Cardioid-like + Waveguide 2-way

9th March 2005, 08:51 AM	#2
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	It's probably the transformer laminations that are buzzing. Since it lasts for only a short period when power is applied, I'm guessing that the tranny is delivering lots of current while it's charging the electrolytic power supply capacitors. Probably nothing to worry about. __________________ Frank

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