At 11:01 AM +1300 1/28/03, Jinx wrote:
>Just thinking.........
>
>If you're using just single LEDs then a 1A Darlington driver
>may be a little over the top. A logic buffer would do you just
>as well, eg 4050 or 7407 o-c output if you wanted to use any
>unregulated voltage available
>
>http://www.cedmagic.com/tech-info/data/7407.pdf
>
>Also, check out the power specs for the PIC. If you use high-
>efficiency LEDs it would be possible to make something
>absolutely blinding (like some bastard did to me the other
>day with super-super-bright greens - they hurt) which is well
>within the PIC's current capabilities

Again thanks for this and other responses.

To make this more specific what I am driving is an RGB LED and an infrared LED.
It looks like each of the 3 elements of the RGB LED wants 30 mA.  The
infrared LED will be driven (oddly enough) with low power...call it
10 mA.

So call it a total of 100 mA being potentially sourced/sunk by the
PIC.  And 30 mA at each of 3 pins.

My reading of the situation is that that is enough to require
drivers, but low power ones like logic buffers...especially since
this is a battery operated device, and I don't want to use more
current than I really need...correct?

Phil

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