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Old 11-16-2009, 10:10 PM   #1
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DC Low Voltage Transformer/Dimmer buzzing


I bought the following DC transformer: http://www.pegasusassociates.com/Ele...ansformer.html to hook up some 12V Xenon under cabinet lights.

I got the DC one because I read that it doesn't suffer from voltage drop over longer runs as much as the AC counterparts. The issue I'm having now is I have it hooked up to a dimmer (a cheap one). Both the dimmer and the DC transformer hum pretty badly.

Is this a result of the bad dimmer? If I put a higher quality dimmer on it (one intended for Low Voltage applications), will it cut the buzzing out from both the dimmer and the transformer? Or just the dimmer (and I'm stuck with the buzzing from the transformer)?

Ideally I'd like to eliminate all buzzing. :-)

Should I have gone for a AC transformer?

thanks!

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Old 11-17-2009, 04:02 AM   #2
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DC Low Voltage Transformer/Dimmer buzzing


On the link you provided above, it says...

["Dimmable: fully dimmable using a dimmer designed for an electronic transformer. An electronic transformer can sometimes work with a standard incandescent dimmer. However, to ensure that your lighting system works effectively with the greatest dimming range we recommend that you use a dimmer that was specifically designed to control an electronic low voltage transformer. Additionally, using this type of dimmer will diminish the possibility of an audible hum when the dimmer is used especially at low light levels. (Caution: dimmer should always be connected to the input side, 120V side, of a transformer.)"]

And it gives a link to here for those dimmers...
http://www.pegasusassociates.com/pro...icLowVolt.html

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Old 11-17-2009, 08:19 AM   #3
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DC Low Voltage Transformer/Dimmer buzzing


Quote:
Originally Posted by Billy_Bob View Post
On the link you provided above, it says...

["Dimmable: fully dimmable using a dimmer designed for an electronic transformer. An electronic transformer can sometimes work with a standard incandescent dimmer. However, to ensure that your lighting system works effectively with the greatest dimming range we recommend that you use a dimmer that was specifically designed to control an electronic low voltage transformer. Additionally, using this type of dimmer will diminish the possibility of an audible hum when the dimmer is used especially at low light levels. (Caution: dimmer should always be connected to the input side, 120V side, of a transformer.)"]

And it gives a link to here for those dimmers...
http://www.pegasusassociates.com/pro...icLowVolt.html
Yep, I just wasn't sure if this was FUD to try to sell their 100$ dimmers. I didn't want to get one and have the same thing happen and not be able to return it - which is why I was asking for some opinions of people here who might have run into this exact situation. :-)
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