Hey all,
        Simple question but it's bothering me.

I've got a simple 2n2222a driving a coil from a pic pin.  When I put
the coil between +5V and the collector, works fine turns the coil on
and off.  But when I try to the coil between the emitter and ground it
doesn't work.  A voltage appears across it, but it's only 3.6V.

I'm trying to switch supplies to the coil so I have to use the emitter
ground set-up.  What's wrong, why can't I use a set-up like this?

I thought it might be due to internal resisitance of the transistor,
but this doesn't make sense because I tried it with a mosfet (IRF540)
and I only get 2.2V across the coil.

Can anyone help me out in finding a way to switch the supply to the
coil?

I'm using 5V and 1.2V if this matters.  Both supplies share ground.

Thanks in Advance,
Aaron

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