>
> OK - here's a solution that has been suggested by a friend
> from the NatSemi
> LM336 regulator diode data sheet
>

        That's going to be hard to beat for cost, I think. Maybe one of
those self-oscillating ones Roman mention might be cheaper (Royce
oscillator?)

        I guess for low power levels, you don't need the power PNP, so its
down to three bipolars and some passives. I've seen a similar one that uses
a NPN and PNP in a multivibrator configuration instead of the differential
pair. uses one more capacitor, but two less resistors.

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