Home made signals with LED

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Danlake		#1 Posted : 28 July 2013 09:47:50(UTC) Retweet
Joined: 03/08/2011(UTC) Posts: 1,571		I was planning to try and build a few homemade block signals for part of the layout that will eventually be semi hidden. Either using a bipolar LED (red/green) or 2 individually LED. My idea was to use e.g. a K84 switching decoder with a 12V DC input and use the address to switch power on/off to circuit. I am sure there must be a simple way to have e.g. a green LED on when K84 activated and when off the RED should be on instead? Or maybe not.... I just want a basic setup, without having to use signal modules, additional relays etc.. The reason being I have a few K84 modules in surplus and not being used for anything. Anyone can help with a simple sketch? Thanks! Brgds- Lasse
		Digital 11m2 layout / C (M&K) tracks / Era IV / CS3 60226 / Train Controller Gold 9 with 4D sound. Mainly Danish and German Locomotives.


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H0		#2 Posted : 28 July 2013 11:22:20(UTC) Retweet
Joined: 16/02/2004(UTC) Posts: 15,265 Location: DE-NW		Hi! Originally Posted by: Danlake I am sure there must be a simple way to have e.g. a green LED on when K84 activated and when off the RED should be on instead? I think so. Bipolar LEDs? With two pins only? The k84 is a two-position switch. You could use AC and have one diode in each k84 branch, but in opposite directions. There could be some flickering. Or use two voltages: ground, +6V, -6V and have the k84 feed +6V in one position and -6V in the other position.
		Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS

1 user liked this useful post by H0		Danlake
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