On Fri, 11 Dec 1998 06:55:13 +1000 "Paul B. Webster VK2BZC" writes: > > Standard light dimmer circuit. The standard light dimmer circuit, of course, is doing phase control timing using an RC network. Although it'd be terribly nonlinear and probably vary unit to unit, it seems that one could "remote" a hardware store light dimmer by using an opto coupler that has a CDS opto-resistor as the output device. Substitute it for the pot in the timing circuit, then vary the LED current (possibly using the PWM output of a PIC). In our light dimmer products (at http://www.dovesystems.com), we use the PIC to drive an opto triac at the appropriate point in the AC cycle (using the capture compare register to generate an interrupt at the appropriate time), or have a PIC do DMX to analog conversion, then drive analog comparators that are comparing the analog with a negative going ramp synced with the AC line. Harold Harold Hallikainen harold@hallikainen.com Hallikainen & Friends, Inc. See the FCC Rules at http://hallikainen.com/FccRules and comments filed in LPFM proceeding at http://hallikainen.com/lpfm ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]