> >Actually, I was just wondering, could I just use another
> > tranistor when selecting the porta pin so that power would then
> > be taken from the main positive power rail? (I might be way off
> > here...)
>
> Yes. You can use an emitter follower, but that's one transistor
> per pin, and there should be a series base resistor to prevent
> possible oscillation. Eg. (only one LED shown, but you get the
> idea)

Good to know that my thinking wasn't too way off, I must be learning
something at least :-) I'll still look into using the source/sink
drivers too though.

Thanks again for the help.

Matt

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Matt N. Marsh
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