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Old 30th November 2005, 08:46 PM   #1
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Location: Boston area
Default Humming Power Supply / Vibration

My mixer has an external power supply, plus an external Phantom Power unit.

The problem that I'm having is that the external power supply hums loudly, NOT through the equipment, but through the air. If I put my hand on it I can feel it vibrating.

This appears to be a home built p/s - it has 2 transformers in it, a big one and a little one, and two very large capacitors, along with other circuitry.

What causes this? Is there a cure? This hum gets picked up by my mics and is quite annoying. I've considered making a very long power cord for the p/s and putting it in another room, but first I want to see if it's something simple.

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Old 1st December 2005, 04:12 PM   #2
sss is offline sss  Israel
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it is caused by the transformer .if the windings are not wound tightly enough they start to vibrate and generate noise ...
things that u can do :
-rewind the transformer and make the windingss tighter - not so practical warnish also helps ...
-use a new ,better quality transformer
if you are not living on the edge you are taking too much space
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Old 1st December 2005, 04:44 PM   #3
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Location: Boston area
I've been surfing the web quite a bit since I posted this...

read about using "red insulating varnish" on the windings, and also about baking the transformers first to remove potential moisture.

Maybe I'll start by varnishing the transformers and making sure nothing's loose inside the box, and if that fails buy replacement transformers. The whole baking process seems kind of elaborate and time-consuming.

I guess another approach would be to figure out the specs on the power supply and buy a new one. But that would probably cost real money.
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