> Actually, the LED's are on 1/3 of the time, not 1/12.
>
> So far, I've found that muxing (with driver transistors) at
> 20mA is bright enough.  And actually too bright at night.
> In this case, it should be the same, but I thought if it
> got to be a problem, I could always drop to some 10mA LED's
> etc.
>
> Cheers
> -Neil.
>

Neil,

If you really want to get cute you could sample the instrument cluster lamp
voltage (via a voltage divider) with another analog input and use it to
perform duty cycle brightness modulation of your LEDs.

Bob Ammerman
RAm Systems

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