Hi all, have a question for you.  I need to control a load using a PIC that
will take a variable voltage.  It is a simple variance, I only want it to
have either +7V or +12V.  Also 0V (off) will be needed.  I know I'll need 2
pins per load on this, perviously I used a power mosfet to provide only +12
and it worked great, so I'm looking for options.

Things I have considered so far:

7V going to one mosfet controlled by pin X
12V going to another controlled by pin Y
to get +7 -> XY=10  to get +12 -> XY=01  to shut off -> XY=00
this seems simplist, but scares me since I could accidentally end up w/both
on

another would involve only 1 mosfet, and an SPDT relay toggling between 7
and 12

what I would *like* would be some kind of voltage regulator with an Enable
pin, something like E=0 provides the input voltage (12) and E=1 would
regulate, to 7.  but I have no idea if these exist (i couldn't find any in a
web search and catalog flip)

any suggestions?  i really need to minimize cost/PCB real-estate, so keep
that in mind.  oh, and the load would be maximum 2A @ 12VDC.  thanks!!!

nick@veys.com | www.veys.com/nick

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