Regular switch that hums

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  #1  
Old 01-28-16, 03:48 PM
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Regular switch that hums

Hi,

I have a regular switch that hums and I'd like to stop the humming.

It is not dimmer switch.
It is controlling an array of 20 10w 24v ridge halogens.
The hum definitely comes from the switch, not from the lights.
It has hummed since it was installed and the switch was supposed to be new then.

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Should I just replace the switch?

Thank you!
 
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  #2  
Old 01-28-16, 04:40 PM
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#1 Looks like a cheap switch.
#2 Never should have been back stab like that, needs to be under the screws on the side of the switch.
 
  #3  
Old 01-28-16, 04:47 PM
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#1 It is a pretty cheap switch $3.
#2 The wires are under the screws. It's just hard to see from this photo.
 
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Old 01-28-16, 05:24 PM
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Are you sure it isn't the transformer?
 
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Old 01-28-16, 05:27 PM
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I replaced the switch with a brand new one and the hum is the same.

I noticed that if i leave the switch off for about the 30 seconds the hum starts very loud and rapidly lowers in volume. I leave the switch off for only a few seconds the hum does not start loud.

Also, I think now that perhaps the hum is coming from the wall behind the switch.
 
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Old 01-28-16, 05:31 PM
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To totally eliminate the switch as the problem just wire nut the two wires together.
I think now that perhaps the hum is coming from the wall behind the switch
Which is why I asked about the transformer.
 
  #7  
Old 01-28-16, 05:36 PM
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Sorry, I didn't see your post. Yes, it must be the low voltage transformer.
 
  #8  
Old 01-28-16, 05:53 PM
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Here is the transformer.
Do you have any advice on addressing the humming?
I suppose I will have to replace it.
I have never replaced a transformer before.

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  #9  
Old 01-28-16, 06:11 PM
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Converting the halogens to 24V leds might lower the current drain enough to lessen the hum. But, I'm not sure 24V leds exist in the same size.

You could try to pot the xfmr in a lot of epoxy resin.

Replace the xfmr.
 
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Old 01-28-16, 06:15 PM
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Thank you. Do you have any advice on the how to pot the transformer?
 
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Old 01-28-16, 06:40 PM
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Can potting the transformer cause it's performance to change or cause it to burn out?
 
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Old 01-28-16, 07:25 PM
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Some hum is just inherent in a transformer. Maybe mount it on rubber isolaters.

Pros, what about a switching power supply?
 
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Old 01-28-16, 07:40 PM
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A switching supply is a good suggestion, but would be DC output. Most Halogens are fine with DC, but it should be verified. Hellog, can you provide details on the lamps you are using?
 
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Old 01-28-16, 08:34 PM
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The bulbs are an array of 20 10w 24v ridge halogens.
 
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Old 01-28-16, 09:45 PM
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I think it might be the transformer . Can you listen while someone flips the switch?
 
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Old 01-28-16, 09:54 PM
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Yes it is definitely the transformer.
 
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