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In lugnet.trains, James Powell wrote:
> > Could you use a "bi-color" LED this way? Polarity one way, light is red.
> > Polarity the other way, light is green. Polarity alternating, yellow!
>
>
> You can get 3 colour LEDs that are designed to work that way. Not sure, but
> think they are orange as 3rd colour though.
>
> <snip>
>
> James
I think with a red/green bi-colour LED you can get any colour between the two by
varying the mark/space ratio of the alternating waveform.
A DCC controller varies the mark/space ratio of a square wave in order to drive
the motor at different speeds, but you might need to shift the level of the
waveform by subtracting a DC voltage to get the LED to work.
Mark
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Message is in Reply To:
 | | Re: DCC Controlled Signal
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| (...) You can get 3 colour LEDs that are designed to work that way. Not sure, but think they are orange as 3rd colour though. (...) Yes it can, motor outputs are reversing. So, using any stationary decoder that can power reversing switch machines (...) (20 years ago, 22-Oct-04, to lugnet.trains, lugnet.parts.mod)
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