Re: gEDA-user: Power relay question

[DJ Delorie <dj@xxxxxxxxxxx>]

> Or 4000-series CMOS logic. Nice thing about 4000 series in this
> application is that it can operate on unregulated 12V.

I thought of that, but a linear regulator just for the pic would be
cheap, and you get debounce, multi-input state machines, and a
watchdog for no extra cost...

Even if I ran a 4000 right on the 12v, I wouldn't count on that 12v to
be very clean if it has motors running off it.  Electrically braking a
motor with an H-bridge can spike the power rails.

And a pic + regulator (sot-26 + sot-323) is probably going to be
smaller than the equivalent 4000-series chips anyway.

But of course, there are zillions of ways of doing it, it's up to the
designer to pick what's best for their needs.


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