>
> Has anyone already been down this road, so I won't have to reinvent the
> wheel? Is there a way to use traditional PNP transistor source drivers,
> but with 5 volts on the base and 12 volts on the collector?
I'm using a bunch of 2N4401 NPN transistors ('bout the same as a 2N2222) and
some P channel MOSFETS to do exactly what you're suggesting (circuit to the
left). I think the MOSFETS are IRFU5305's but there are lots of suitable
(and severe overkill) parts out there.
http://n3ox.net/projects/stepperswitch/schematic_lg.jpg
It says "to motor phases" but I'm using identical circuits that I built into
my RCS-8V to run the relays. A nice upgrade would be to replace the NPN
transistor with an optoisolator.
73
Dan
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