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I've done oscillating ditch lights and beacons using ledsCheck out n-gineering.com.There's a section of soldering tips that's very helpful.
TCSdecoders are far more LED friendly. Side by side with Digitrax they are noticeably smoother for intensity transitions like ditch lights. Resistors are built in TCS decoders, so that extra bit of agony is avoided...
I've added separate lightning functions for headlights, number board, and beacons to N scale diesels, plus done a few sound decoder installs.Link to pics of this engine in a past Weekend Update:https://www.therailwire.net/forum/index.php?topic=24141.msg236022#msg236022My best advice to you about soldering on small components like this is to remember to let the iron do the work. Let it transfer heat to pads and components without putting pressure on the soldering iron. A little dab of fresh solder on your tip will help. Clean your tip on a wet sponge between every joint. Be quick. You want to place the iron, melt the solder, align your pieces, remove the heat (iron), and be done. Too much heat for too long will lift pads off PCB's and damage components.Good luck.