Hi Tony, the opto-isolator I used was Digikey part # MOC3011M-ND I sent ann email to the PICList at the time and Bob Blick said that the triac was a non-critical part. Bob suggested using a triac from Radioshack. I think I order the triac from Digikey. T2800 rings a bell, but I could not find it at Digikey ? Just a reminder, I was strickly switching 120V 60W light bulbs, your needs maybe different than mine. Good Luck, Kevin -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.