[sdiy] Variable Voltage Regulator as replacement?

[Ingo Debus]

Seb Carr wrote:
> >     I have also used zener diodes in the ground leg.  Like if I need a 10 volt
> > regulator, you put a 5 volt zener in the ground leg of a 5 volt regulator.
> >
> >
> >
> Up to what point does this work e.g. could i put a 43.0v zener in the ground
> leg of a 5v regulator to get a 48v supply for phantom power, or is this
> taking things way too far?

I'd rather use a 317 here (with resistor divider, just as described in
the data sheet), but I think a 5V regulator would work also. But anyway,
these "high voltage" power supplies are no longer short circuit proof.
If the output is shorted to ground, the voltage difference between input
and output of the regulator IC gets too high.

Ingo