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Subject: Re: TRIAC "wears out" on dimmer circuit
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Date: Thu, 24 Oct 2002 13:23:31 GMT
In article , John
>I have a 240V 0.47uF capacitor connected across the triac output, but
>no inductor in series. I tried using inductors before and after the
>triac stage with no noticeable reduction in EMI. There is obviously a
>design flaw on my part and any suggestions would be appreciated.
The cap will be a momentary short circuit on switching. The energy stored
(or becoming stored) in the cap may be enough to life your triac. Consider
a resistor in series with the cap to form a snubber. I'm out of touch on
appropriate values for this app, but 220R 1W Carbon would be a starting
point - carbon cos it's surge capable, it will see a peak power of 260W as
the triac switches.
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