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In lugnet.trains, John Gerlach wrote:
> In lugnet.trains, Horst Lehner wrote:
> > Both the red and green light are controlled through just two wires. If
> > you apply 12V DC one of the lights will come on. If you reverse polarity,
> > the other will come on. So, only one can be on at a a time, unless you
> > apply AC. But I think it makes no sense to light both red and green at
> > the same time anyway. I don't know how suitable such a red/green light
> > brick would be for DCC applications.
>
> 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!
>
> (Ok, that last part is probably a pipe-dream... <grin>)
>
> Can DCC output a voltage with either polarity, or are you limited to one?
>
> JohnG, GMLTC
> -- still learning about DCC
I was thinking of something similar. Using 2 outputs you could control a 3 lead
Bicolor LED. Or with a small NAND gate as well, you could use the 2 lead style
LED that you mention. If you don't mind the LED always being on it only takes
one output.
Or you could use a DCC motor controler, which does allow you to reverse 2 wires.
Combine it with the light out output and you can get blinking as well.
But I don't think this is worthwhile with RCX control. But with a nice DCC
controler, or with automated control it will be great.
Keep us posted Mark.
Mat
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Message is in Reply To:
 | | Re: DCC Controlled Signal
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| (...) 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! (Ok, that last part is probably a pipe-dream... <grin>) Can DCC output a voltage with either (...) (22 years ago, 21-Oct-04, to lugnet.trains, lugnet.parts.mod)
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