piclist 2002\06\17\150405a >
Thread: interfacing a a relay (automotive world)
www.piclist.com/techref/io/motors.htm?key=relay
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face BY : Erik Jacobs email (remove spam text)



> I think this is what we're all thinking of.

Yes, that's it.  My question (posed to someone else privately) is:  Why do
all the diagrams I see for this sort of thing typically use a BJT?  Is there
any reason that a BJT is preferred over a MOSFET?  Could one just as easily
use a MOSFET here?  I plan on having up to 3 devices being controlled by
relay circuits like this, it seems that it would be easy to just get an IC
that has several transistors on it and wire it up like that.

> You can get both the transistor and diode in a TIP series
> Darlington transistor package. I used automotive relays
> in my homebuilt thermostat project.

Do they make several TIP120 devices in a package?  say 3 or 4?  I find
Fairchild's site very difficult to navigate -- I can't find Darlingtons in
their product groups unless I search for them and then I just get listings.

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