Bala, search the archives for a posting by me re: subject where I posted a snall program to control a synchronous motor fan or heater using full wave switching. The thread was: "Squirrel cage fan motor or heater control (xfan1)" Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body