Dave Dilatush wrote:
>=20
> Alexandre Guimar=E3es wrote...
>=20
> >    No getting back to the SMPS. I will have an application where I wi=
ll
> >have to make a supply with 74 volts DC input and 24 v at 300 ma and 5 =
v at
> >30 ma. I am thinking about using 2 of your 2 transistor designs modifi=
ed to
> >the my specific needs. When I finish it I will let you and the list kn=
ow how
> >it goes and what modifications are needed.
>=20
> With those voltages and currents, why not use Russell's design to step
> the 74 volts down to 24, then Roman's circuit to step the 24 volts down
> to 5?  Russell's circuit is probably more suited to the high-voltage
> part of this thing, especially if you need 300 milliamps out of it.


I lost Russell's 3-transistor circuit, if that's
the one you're referring to, I will add it to the
page if someone can email it to me.

Just from curiosity, why Russell's circuit for the
higher voltages?
-Roman

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