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ligth a triack

 
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chava



Joined: 07 Sep 2003
Posts: 56

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ligth a triack
PostPosted: Thu Feb 12, 2004 4:44 am     Reply with quote

Hello
I want to ligth a triack. what I want to do is to sample the phase input an give a short pulse avry half cycle to ligth the triack in different positions
does anyone have something ready?
Pete Smith



Joined: 17 Sep 2003
Posts: 55
Location: Chester, UK

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Re: ligth a triack
PostPosted: Thu Feb 12, 2004 6:08 am     Reply with quote

chava wrote:
Hello
I want to ligth a triack. what I want to do is to sample the phase input an give a short pulse avry half cycle to ligth the triack in different positions
does anyone have something ready?


Is this for a lamp dimming application?

If so, all you need to do is get some form of zero crossing detector, and start a timer/delay running when you have a zero crossing transition. When the timer/delay is finished, you can turn the triac on.

This has been discussed previously on this board.

http://www.ccsinfo.com/forum/viewtopic.php?t=17460&highlight=dim+dimming

http://www.ccsinfo.com/forum/viewtopic.php?t=17958&highlight=dim+dimming

HTH

Pete.
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