>
>The customer only wants two digits, and I guess I can put at least 5 in
>series, so that would be 7 x 2 x 120 x 0.02 / 5 = 6.72 A. No problem for a
>car race environment where accu's are found all over the place. But how
>large were your digits?


I'm pulling a similar project, a replacement for a whelen slimlighter.

The original is driven by an 8 pin PIC, but it failed after only an hour of
use, and is stuck on one flash pattern.  I'll use an AVR2343 of course.

The slimlighter uses two banks of 4x20 orange leds.  I'm using two banks of
HP hyperbright 10,000 mcd lamps Eacn bank will draw about an amp with the
LED current set to 50mA at 15V input.

I don't know what the slimlighter led specs are, but it puts an impressive
spot on the wall across the room.

They go for about $0.22 each in moderate quantities.
Doing projects like these, it's easy to see where 1000 leds could dissapear
real fast.
(until you turn them on!)

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