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Old 14th September 2010, 02:41 AM   #1
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Default quasi variac controlled wallwart

If one plugs a wallwart into a light dimmer ?
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Old 14th September 2010, 03:00 AM   #2
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It might work,kinda,depending on the dimmer. Most dimmers can not handle inductive loads,only (mostly) resistive loads.

You may also have noise on the wall wart output,due to the 'chopping' of the dimmer.
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Old 14th September 2010, 03:00 AM   #3
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It'll probably work OK if you use the expensive dimmers intended for fluorescents and not the cheap ones for incandescents. Of course you haven't said what you are trying to achieve so it's hard to say if it's a good idea.
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Old 14th September 2010, 03:49 AM   #4
star882 is offline star882  United States
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A normal dimmer won't work with inductive loads, but a ceiling fan speed control will.
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Old 14th September 2010, 03:51 AM   #5
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Quote:
Originally Posted by star882 View Post
A normal dimmer won't work with inductive loads, but a ceiling fan speed control will.
What's the differance ?
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Old 14th September 2010, 02:29 PM   #6
star882 is offline star882  United States
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The triac is rated for inductive loads, there's more filtering, and the circuit is designed to always be DC balanced.
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Old 14th September 2010, 04:25 PM   #7
stoc005 is offline stoc005  United States
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Beware of light weight walwarts. They are transformer-less and contain a switch mode power supply. Won't work at all on a dimmer.
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