Dave,
I'd suggest you include at least an ASCII diagram of the circuit as it
makes it a lot easier to visualise what you are trying to do - or at least
how you are trying to do it.
Alternatively put a gif up on a web site somewhere or send it to me direct
& I'll have a quick look.

If you are using MOSFETS you will need more than 3.3V on the gate to turn
them on properly. If you have only this voltage to play with you will need
to change to a bipolar power transistor or arrange a higher voltage gate
drive supply using a charge pump/aux supply or whatever. It would only need
a mA or so depending on switching rate.

Richard



I've been trying to get a power transistor to behave for the last week or
so.
I've been trying to drive 3x 3v 350 ma led (yes each one is 350ma) with a
specific pattern.
The pic generated signal is of course flawless but when I've tried to get
the power
transistor to function I get either spurious signals or it just sits there.
I've been trying
to use a 2N2222 to drive various power mosfets that have been suggested.
Nothing seems
to get this close to what I need. The biggest problem is that this needs to
be done with
3.3V which seems to be proving the big problem. The 3.3 was chosen to
eliminate a few parts
and keep the heat down, ie some of the parts eliminated were power
resistors.

I've tried drivers, converters and tried tweaking the 2222 to the nth
degree without satisfaction.
I've even rtfm'd just to make sure I wasn't pulling a total boner. I'm sure
this is doable it would
be close to a 20% duty cycle motor controller (yes tried that way too).
Could anyone help
me sort this out?

Tnx

Dave

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--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.