It's a P-Channel Mosfet. I did not see the diagram, but it must have a
pull-up resistor to ensure proper turn-off.

Marcelo Y.

Roman Black wrote:
> Tim Thompson wrote:
> >
> > Hello all, once again,
> >
> > I'm attempting to make a PSU based off the attached schematic. The
problem
> > I'm having is the MOSFET wont turn off.
> > Its allways 'on'. As soon as +12 is applied the circuit comes alive,
> > regardless of the state of its Gate. Pull it high or low and its still
on.
> > The MOSFET I'm using is a MTP2P50E, its made by Motorolla and its
datasheet
> > can be found on www.onsemi.com, just search for that PN.
> >
> > Anyway if anyone has any suggjestions, lemmy know.
>
>
> Hi Tim, your circuit misses the important bit.
> The bit that drives the FET. :o) Your circuit
> also says 1.5v where I think you mean 12v?
> And is your FET an N type or P type device?
> -Roman
>
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