>Do you have a higher supply voltage available?  Most FETs - even logic
>level FETs - will not fully enhance below 4V.
I actually compromised and went with 3.3V on the board. I thought that
was a good thing as the per board cost dropped from about $47 to about
$7. I didn't think I was going to give myself a stroke getting these #$%
transistors to behave.

>You can use a Darlington bipolar transistor: one NPN part I use is
>TIP121.  Feed the base with a 220R resistor (Ib ~ 10 mA if Vdd=3.3V).  The
>collector will handle 2 Amps easily - but with a fairly nasty saturation
>voltage of about 1V.

I'll see if that would work with this. I'm sure there is some part that
will but
I've not stumbled across it yet.

>If you DO have a higher supply available, use it to turn on a MOSFET.  For
>example, where is your 3.3V derived from?  Can you use that?

I have a smart smps as I don't know exactly what my power is going to be
out in the field. So all I can count on is the 3.3.  I've been debating if
I need
to scrap the 3.3 and go back to 5vdc but then I need to start adding back in
parts.

TNX

Dave

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