RailPro > RailPro Specific Help & Discussion
LED headlights hooked up to an LM-3S.
SWA737:
I have so far converted 42 engines over to RailPro. All of them to date already had LED headlights so I simply used those. Just purchased two older atlas GP7’s with incandescent bulbs. I want to swap them out for LEDs when I do the conversion in the near future. Is there a specific place to purchase them and also, which LED’s. And also, does the power coming out of the light source from the decoder already set to the proper voltage for LEDs or do I need resistors for that in line? Could not find anything on the specs on the railpro decoder’s to see the voltage output on those pins.
Thanks,
Rob
nodcc4me:
Rob, you will need resistors with LED bulbs.
Here is a discussion with some helpful information about bulbs and resistors:
RailPro User Group - Choosing LED's (pdc.ca)
SWA737:
Thanks Al.
SWA737:
Hey Al,
I am on Evan’s site with all of the LEDs. Found it on that link you gave me. Unfortunately, I might be more confused now. Any chance you would have a few minutes to go on that site from that link and tell me which LED voltages to pick up. He also says he has resistors already set for the proper voltage. Again, I have no idea what voltage is coming out of the LM-3S’s from the headlight ports. I’m still missing key components to getting the right thing. If you can tell me which LED’s to get for a couple of GP7’s and also if I select the one where he already has the resistors on them, that would help me a lot. Kevin’s explanation on the flat ones versus the nano does make sense to me. I just still need voltage and resistors. Thanks Al. Sorry I’m a little bit slow on this subject.
Rob
nodcc4me:
I used 3.0v LED's. They come in different sizes, but as Kevin mentioned, the small ones can go almost anywhere. I bought just the bulbs and added my own resistors, 1000 ohms, 1/4w. I believe the lighting outputs on the LM3-s output the full track voltage, which is required to supply older incandescent bulbs, but I'm not positive about that. Order the correct resistor size for the bulb's current rating. This is what Ring recommends:
Use 1000 ohm 1/4w resistor for 15ma or 750 ohm 1/2w for 20ma.
I hope this helps, but if you are still confused, don't worry. We've all been there. ;)
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