>regulator designed.  The 78L05 sucks 2-3mA Q current, way too much.
>Looking for 50-100uA.  The low dropout regs are neat, but they have a
>very limitted Vin max.  I need 30V.  I built a pass regulator with a

I'm using some of the old National LDOs (LM2941).  They can take the
voltage, but the quiescent current is way more than 5ma!


>res, zener, and NPN trans, which meets my goals, but since the current
>through the zener is low, then as the V on the C drops off, then the V
>on the zener drops off, and the V on the PIC droops as well.  This
>causes the RC osc to skew, and my highly important timer gives me
>predictable garbage!

Low voltage and current starved zeners suck.

I've used series (REF-02) voltage references for precision low current
regulators in the past.  You might look into replacing the zener with a
micropower shunt regulator (bandgap ref) that will regulate much better at
low currents (10 uA).

Check out LM385 (shunt) and LM2936 (series).


newell