Also see AN521, interfacing to AC power lines.  I have used this to make
dimmers that work fine.  With this zero-crossing sync, you can then do the
same thing as with DC PWM, within each half-wave.



At 08:50 PM 12/1/97 -0500, you wrote:
>At 11:36 AM 12/1/97 -0800, you wrote:
>
>Check out
>
>http://www.microchip.com/10/Appnote/AppNotes.htm
>
>and look for PICREF-4 (PICDIM Lamp Dimmer for the PIC12C508)
>
>MD
>
>>>>>
>Hi--
>
>Does anyone have a circuit and some code for driving a 60 Hz, mains-line
>synced  PWM?  I need to create an AC dimmer for 120V incandescent lights
>that will  operate under PIC control.  I know it's been done, but I have
>yet to see a  lucid explanation of how the routine works...
>
>Thanks-- I thought I'd see if anyone can help so I don't spend development
>time  re-inventing the wheel!
>
>
>--Alan McFarland
>Alan McFarland's Applied Magic
>Custom Electronics for the Motion Picture Industry
>Lighting and Electronics for Models, Miniatures, Props & Sets
>
>http://www.appliedmagic.com
>
>
><<<<
>
>--
>Martin Darwin    a.k.a Rambo [CtF]
>martin@davin.ottawa.on.ca          3rd year Computer Engineering
>http://www.davin.ottawa.on.ca/~martin  University of Ottawa
>Quake Clan Ctf - http://ctf.clanworld.com - IRC #capture
>
>


Bruce Cannon
Style Management Systems
Remember: Electronics is changing your world...for good!