Dave,
        For lack of information, I will explain a few ideas. First use an N-Channel
FET and drive the circuit from the ground side. Use a logic level FET if
using a microcontroller directly. Example: controller output pin to a 100
ohm resister to the gate of a logic level FET.

        If trying to high side switch the FET, you will require a gate driver that
can produce about 15Vdc above the input voltage source. You pulse period is
to long to boot strap the gate.

        Use a PNP transistor on the high side and drive it like a series pass
regulator.

Good Luck

Gordon Varney
www.iamnee.com



> Hi
>
> Just wondering if anyone has any information or know of any on-line for
> interfacing a
> power transistor. I'm trying to drive about a non-inductive 2 amp load.
> This circuit for
> lack of a better description would be the blinking led on steroids. The
> signal is 2 pulses
> (1/10th duration) at 1hz. Board voltage is 3.3vdc.
>
> I've tried a few various fets and such but haven't found one I can get to
> turn on cleanly.
> I also tried driving a mosfet with a 2n2222 but that didn't work
> out either
> (even though it
> should).
>
> I'm missing something here but I think I've been staring at it too long to
> figure out what so
> HEEEELLLLPPPPP!!!!
>
>
> Cheers
>
> Dave
>
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