At 12:05 PM 8/3/01 +0200, you wrote:

>
>I hope this will be clear. What will a common industrial solution be to this
>problem?

output                   LED
push-pull        -------|<|-----[330R]---- +5
              |/
----[10K]-----|     2N3904 etc.
              |\ E
               0V

Iled ~= (4.9V - Vf(LED))/330   (so 8-10mA for green/yellow/red)
Iin = 440uA

Best regards,
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Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
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