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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