Csaba, > Why not use igbt or powerfet? Cheep, have a ttl comp driver chip, you > can turn off anytime you want, etc. AFAIK, Triacs are a lot more cheaper than IGBTs or Power Mosfets. Atleast that is the case in India. And since they still are in production, its ample proof that a lot of people still use em. Don't take me for a Thyristor loyalist. But Triacs and SCRs can be very useful at times. Jeethu Rao -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu