> > 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.


Getting better!
Can you post a simple circuit and comment on its capabilities.


        Russell McMahon

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