DJ Delorie wrote: > What about a BJT emitter follower with a 5v zener C-B and resistor to > ground? Shouldn't that give you a constant voltage drop (letting you > optimize the transistor selection) without the drawbacks of a plain > series zener? > > > ------+-------- ------------------ > | \ _/ > | \ /| > ___/ ------------ > / ^ | > /_\ | > | | > +-----------+ > | > \ > / > / > \ > | > | > --- > \ / > v >
Yes, where the load is on the emitter. You could also use one of those FETs. I"d rather see the zener to common with a resistor above it drawing some reasonable current to give a less able to oscillate voltage to the base or gate... John Griessen -- Ecosensory Austin TX tinyOS devel on: ubuntu Linux; tinyOS v2.0.2; telosb ecosens1 _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
