On Wednesday 09 July 2003 14:33, Olin Lathrop scribbled:
> However, FETs have disadvantages too.

Some time ago, I pretty much did one of the things Brian wants ... replac=
ed=20
the PN2222A's with 2N7000's and eliminated the base resistor.  In some we=
eks=20
of usage, the TO-92 packages don't get hot (or even warm), and I haven't=20
destroyed the PIC..... so far.


> First, they usually cost more.

Usually being the keyword.  I found that mouser's price on Fairchild 2n70=
00's=20
was $0.08 each, and their ST PN2222A's were $0.06 each.  Insignificant=20
difference.


> Second, they require significant gate current to switch quickly.

Can you explain "significant"?  How would this be calculated?


Cheers,
-Neil.

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