At 04:22 PM 11/17/2009, Josh Koffman wrote: >I'd be interested. So far I've decided to start with a HEXFET and >driver from IR. But I'd love to see what others are doing. Our DC dimmers are a 12F675 or 12C508 driving a IRF3708 MOSFET via a 47R resistor. Brightness control is a rotary pot using a RC-time type measurement (12C508) or DC voltage from 0 to 5V (12F675). The MOSFET is a logic-level device and does not need a driver. We do PWM at 500Hz or 977Hz or 4 KHz, depending upon which version we are shipping. There is also a clamp diode (mbr1045) connected across the load to deal with inductive spikes. The 3708 MOSFET is good for at least 10A without heat-sinking and we routinely drive 30A loads by using the aluminum case as the heat-sink. We've got code in both assembler and PICbasic (again - different versions for different customers). Pretty simple stuff. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist