On Thu, 31 Jan 2002, David VanHorn wrote:

> >
> >So what you need is some simple way to switch off the regulator and have
> >its o/p volts go to zero when it's OFF = when the npn tarnsistor is OFF.
>
> P Channel mosfet on the output, or use a reg with a shutdown pin.
  like LM317 for positive voltage, or a simple npn in series with the
output reg.

  Vasile

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