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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
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Message has 3 Replies:
 | | Re: DCC Controlled Signal
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| (...) 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 (...) (20 years ago, 21-Oct-04, to lugnet.trains, lugnet.parts.mod)
| | | 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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Message is in Reply To:
| | Re: DCC Controlled Signal
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| Hi everybody, (...) Correct. 7860 is the set number. A quick Google search turned up mostly auctions and sales pages, no useful description of this set, so here go some basics for the interested ... Both the red and green light are controlled (...) (20 years ago, 21-Oct-04, to lugnet.trains, lugnet.parts.mod)
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