I want to be able to have a PIC run a large number of elements that need
higher voltage than the PIC can handle.

For devices that can be configured to sink, the ULN2003 series works great
and are cheap at $0.50 to $0.10 depending on quanity.

Sourcing current seems to be a much more expensive proposition.  I found
some MOSFET based devices like UDN2982A that can do 500mA at 50V and are
logic controller which is a plus.  But they are $2.00 to $1.50 in quanity
with 8 pins of output.

Kind of expensive if I want to run 50 or 100 lines.

In case you are wondering what I am up to, I'm just looking for general
purpose ways of doing this.  I like to play with banks of LEDs, motors,
relays, VFD displays, ect and always seem to run into the problem of
neefing to multiplex a lot of source currents.

--
Ian Smith
www.ian.org

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