Don Shankin wrote:
> Are you talking about MOSFETs? They're essentially voltage-controlled
> transistors (as opposed to being current controlled).
Yes, there is a new breed of MOSFETs called "self-protected MOSFETs"
that are specifically designed to be driven from logic levels and that
protect against all kinds of problems. For example, see:
http://www.onsemi.com/PowerSolutions/parametrics.do?id=819
The last time I looked (about 6 months ago), they only produced them in
tiny surface mount packages (which are too small for my eyes and
soldering skills :-) However, while googling to answer this question, I
see that they are now producing them in good old TO-220 packages, so
I'll have to see if my normal electronics suppliers stock them as well.
The nice thing about this new breed is that (a) they are designed for
logic level inputs, (b) they protect the logic circuit from load
problems and (c) they don't need suppression diodes when used with
inductive loads. Basically, they are a one package solution for
switching 4-6A loads. When I start noodling with circuit designs in
the winter (the official season for circuit noodling) I plan on playing
with them to see how well they work for my purposes (cheap, durable,
easy to repair).
Frank P.
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