>
> On Wed, Dec 29, 1999 at 06:15:20PM -0500, Byron A Jeff wrote:
> > So I plan to use this config:
> >
> >     +12
> >      |
> >      D
> > A-->G
> >      S
> >      |
> >      |-----| |------
> >      |
> >      D
> > B-->G
> >      S
> >      |
> >      |
> >     gnd
>
> To activate MOSFET A you would need the gate to be 5V higher than the
> source.  This is easy with MOSFET B because the source is at ground.
> But MOSFET A would only trigger if the voltage at source is at or below
> ground potential, right?

Normally true except I'm using IRFZ44 logic level MOSFETs. They have
internal circuitry so that they are fully on at 5V.

>
> > One last question. Can anyone explain the difference between using a Zener and
> > a 7905 regulator?
>
> As sole regulation?  Zener would try to sink any excess current.  7905
> would instead partially close output in order to avoid exceeding volts.

So I guess I'll use a 7905.

BAJ