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Mjn2ts		#1 Posted : 25 March 2025 16:56:49(UTC) Retweet
Joined: 04/10/2021(UTC) Posts: 56 Location: Maine, Lewiston		I've seen some locomotives that have white lights in the front and red lights in the back and then they change when the loco changes direction. Is there any other way to do that besides putting in a red and a white led in each end of the loco? Another side question, what size led (3mm, 5mm etc) is commonly put into locos? Thanks as always... Jeff

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rhfil		#2 Posted : 25 March 2025 17:02:46(UTC) Retweet
Joined: 05/09/2014(UTC) Posts: 674 Location: NEW HAMPSHIRE, Somersworth		I am by no means very knowledgeable on this but I believe that some leds can produce more than one color.

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H0		#3 Posted : 25 March 2025 17:13:49(UTC) Retweet
Joined: 16/02/2004(UTC) Posts: 15,432 Location: DE-NW		Originally Posted by: Mjn2ts Another side question, what size led (3mm, 5mm etc) is commonly put into locos? That depends. I converted some Märklin locos from yellow LEDs to white LEDs - they were the 0603 SMD type, 0.75 mm by 1.5 mm. I also used 0603 when adding cab lights to some locos. Some Märklin locos have red and white 0603 side by side, serving the same plastic light channel. There are dual red/white LEDs with three pins that can be used for conversions of older locos.
		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

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Mjn2ts		#4 Posted : 25 March 2025 17:49:32(UTC) Retweet
Joined: 04/10/2021(UTC) Posts: 56 Location: Maine, Lewiston		Originally Posted by: H0 Originally Posted by: Mjn2ts Another side question, what size led (3mm, 5mm etc) is commonly put into locos? That depends. I converted some Märklin locos from yellow LEDs to white LEDs - they were the 0603 SMD type, 0.75 mm by 1.5 mm. I also used 0603 when adding cab lights to some locos. Some Märklin locos have red and white 0603 side by side, serving the same plastic light channel. There are dual red/white LEDs with three pins that can be used for conversions of older locos. exactly what I was looking for, found them on ebay. thanks Jeff

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JohnjeanB		#5 Posted : 25 March 2025 23:05:32(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,550 Location: Paris, France		Hi Jeff Märklin uses more and more surface mounted device (SMD) LEDs very small in size (1 mm in lentgh) For the replacement of a yellow LEDs on a Kittel, I have used pre-wired bi-color leds I think the used LEDs were similar to these https://www.ebay.de/itm/19616375...D%7Ctkp%3ABk9SR8rAn_W5ZQ They MUST be with a common anode or with 4 wires Using bi-color chips w/o wires is quite tricky Cheers Jean
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