As others have suggested, you can use an opto isolator to drive a triac.
This is what we do in our Shoebox series of dimmers
(http://www.dovesystems.com/BuildPage.php?page=shoebox). These are used
in applications similar to yours by Atlantic Fountains (see
http://www.atlanticfountains.com/). For small quantity stuff, it's
probably a lot simpler (and safer) to just use a solid state relay. An
SSR has the same circuitry, but it's all put together for you. There are
some inexpensive SIP SSRs (for example, see
http://www.crydom.com/assets/ssrpcb/cx.pdf and
http://www.digikey.com/scripts/us/dksus.dll?Detail?Ref=65203&Row=122195).


Harold


FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

Reach broadcasters, engineers, manufacturers, compliance labs, and
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