Mark Rages gmail.com> writes: > > Would not the base current sourced by Vsupply, and, therefore not measu= red in > > the collector current? This assumes that output transistor will be npn > > connected as emitter follower, of course. >=20 > Yes. Extra unmeasured current will be delivered to the load, > introducing an error in constant-current mode. >=20 > Regards, > Mark > markrages gmail >=20 OK, thanks. I got my currents mixed up :-).=20 Sergey=20 http://beaglerobotics.com --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .