Sorry Guys, I think I confused the matter a little with the 12V. The AC Motor is brushless and phase control should work from what I know so far, a lamp dimmer appears to be the best solution but I needed a ready made circuit that could be incorporated into an existing design quickly, we did indeed end up using a lamp dimmer capable of controlling a 100W bulb, and had to adjust this manually. Has anyone got a design that could control flood lights 500W to 1000W used outside security lights, the ones used in the back garden with a PID. We can supply a variable control voltage from 0 to 12V in 16Bit steps but this will only source a few hundred milliamps. Thanks for your help so far Andy Faulkner ===== Andy Faulkner andyf97@yahoo.com Pyrosync International http://www.pyrosync.co.uk Tel +44 778 896 6087.....................UK Dial 0778 896 6087 Fax +44 870 132 3275.....................UK Dial 0870 132 3275 http://www.event-supplies.co.uk http://www.spectacular-fireworks.co.uk __________________________________________________ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/ -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body