At 12:38 AM 5/13/01 -0500, you wrote:

>
>Sure thing, it's simply a 12VDC fan, the ones in question can draw between
>.5A and .7A and I would like to be able to hook 2 up to each line, hence the
>1-2A...  Hope this helps!

For a typical 12V brushless fan, you can use a power MOSFET, but it has to
be a "logic" type to allow it to be driven directly from the PIC (preferably
through a resistor, and you should put a diode across the fan (reverse
biased),
a 1N4004 should suffice.

For example, an IRL3102 (about $1.35 in 10's from digikey)

                    x----|>|----x
              D     |           |
             |------x---[fan]---x- +12
PIC --Rs --| |
         G   |---  0v
              S

Rds(on) of this part is 13m Ohms, so the power dissipation at 2A is
only 52mW (you won't need a heat sink!)

Best regards,

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Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
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