> 4.5 watts? That must be one hell of a flashlight. It's a big 6v rechargable one. The flashlight doesn't work, but the bulb does.
> > One of these days I'm going to make a digitally-controlled load. It's > > just a monster FET with some control circuitry, right? > > Basically, yes. But in order to dial in resistances you must find two > that are nearly identical (pairs are rare in the power class) I saw an appnote about one FET that had a different temperature coefficient, so could be used paired (for heavier loads), because if one overheats it *reduced* its conductivity - they ended up balancing. But I suspect that's not what you're talking about - you're talking about a current mirror, yes? > and servo it with an opamp. I knew that part. > Or just command currents, then it's down to one big FET. One FET, one current sense resistor, and an opamp, plus however you derive the control setting for it. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
