Loud 3000 power supply (not fan related)

bitter · 10 February 2022, 01:20

I got a nice Noctua fan to replace the old monster in my 3000 power supply. To my surprise, while it's much quieter now, there is a pronounced buzz, or hum coming out of it. I disconnected the new fan to test but that didn't change anything. Any idea what could the source of it be? It works perfectly fine and supplies proper voltages...

Here is a couple of pictures, including some nastiness on top of the main transformer as well as yellow glue between the three tall caps. Any idea what it could be, and how to get rid of it?

trixster · 10 February 2022, 13:38

Make sure your noctua has as much pressure as the fan it replaced!

jbenam · 10 February 2022, 13:41

It's probably coil whine. Has the PSU been recapped?

Totomoto · 11 February 2022, 11:24

Probably coil whine. While the power is on, try to lightly touch it with the plastic pen and see if buzzing goes away.

bitter · 11 February 2022, 20:34

Quote:

Originally Posted by jbenam

It's probably coil whine. Has the PSU been recapped?

Not yet, but that wouldn't effect the coil whine, would it?

bitter · 11 February 2022, 20:35

Quote:

Originally Posted by Totomoto

Probably coil whine. While the power is on, try to lightly touch it with the plastic pen and see if buzzing goes away.

Will try that!

jbenam · 11 February 2022, 22:45

Quote:

Originally Posted by bitter

Not yet, but that wouldn't effect the coil whine, would it?

Coils can whine if there is ripple in the voltages (which can be caused by failing caps), at least from what I have heard.

10 February 2022, 01:20	#1
bitter Registered User Join Date: Oct 2018 Location: Fort Mill, SC, US Posts: 83	Loud 3000 power supply (not fan related) I got a nice Noctua fan to replace the old monster in my 3000 power supply. To my surprise, while it's much quieter now, there is a pronounced buzz, or hum coming out of it. I disconnected the new fan to test but that didn't change anything. Any idea what could the source of it be? It works perfectly fine and supplies proper voltages... Here is a couple of pictures, including some nastiness on top of the main transformer as well as yellow glue between the three tall caps. Any idea what it could be, and how to get rid of it? Attached Thumbnails

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10 February 2022, 13:38	#2
trixster Guru Meditating Join Date: Jun 2014 Location: England Posts: 2,356	Make sure your noctua has as much pressure as the fan it replaced!

10 February 2022, 13:41	#3
jbenam Italian Amiga Zealot Join Date: Jan 2009 Location: Italy Age: 36 Posts: 1,913	It's probably coil whine. Has the PSU been recapped?

11 February 2022, 11:24	#4
Totomoto Registered User Join Date: Feb 2022 Location: Belgrade Posts: 5	Probably coil whine. While the power is on, try to lightly touch it with the plastic pen and see if buzzing goes away.

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