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Ah, I just saw this last night, on the Showcase Miniatures website. Very nice signal, but I'm just not all that excited about the fiber optic lighting.Back in the early 90s I build this type of a signal as a proof of concept. I was dabbling in photoetching and I finally found source of small (3mm) sized 3-color LEDs! At that time most 3-color LEDs were 5mm. Using a lathe I turned down the LEDs as small as I could. I used the common lead as a mount for signal head. At that point I didn't have viable hoods for the lenses.
Like I've said before. I would go for some of these.
My signal used an LED with red/green chips to get 3 colors (red and green on together simulate yellow light), but I figure that nowadays, it would be possible to find a 3-chip SMD LED which would produce true red, green and amber light and which could fit in the signal head. Based on experience with building my own signal I realize that the wiring would be a bit more complex than just threading 2 optical fibers through the mast, but overall this would result in a more realistic signal. But the bottom line is that I don't care much for the small point of light visible at the end of the optical fiber. I would prefer a larger diameter source of light. The optical fiber looping into the mast also looks a bit odd, but I guess that there have to be tradeoffs. The signal I built had more realistic wiring, but the signal heads were not true to the prototype.
First off Peteski nice work and you mentioned the early nineties, that was about the same time that Dan Crews (Sunrise Ent.) was in full swing offering some very beautiful models. I believe his production models used the same method of LED lighting as your study. Please let me know if you find an LED that fits inside the dimension of one of our true to 1/160 heads. We will definitely consider trying to build it with that LED. We did the r&d before we produced the signal and we did so with the help of Jim Hinds http://www.richmondcontrols.com/ Jim’s Richmond Controls is known internationally for LED lighting kits. Jim has developed a very small tri-color LED that we use and recommend for lighting our HO signals. It is probably the best RYG LED available to us model railroaders (with the leads already attached). In regard to our N scale signals, Jim showed us some alternative smaller LED packages but we still could not get one to fit in a true to scale 1/160th H2 head. Once that determination was made the fiber optic became the most practical choice.From the beginning our emphasis was on the scale fidelity of the signal components. Our thinking is that those who are very particular about any aspect outside of the static scale look of the signal itself could opt to modify or replace part by part according to their taste. In the meantime (the finished signals) we have provided a way that achieves a practical way to animate the signal. Who knows maybe time and experimentation will yield a new method altogether. It is funny though light tubes have been perfectly acceptable for the ditch lights on some of the Kato locomotives. Is that less than ideal?I have learned that scale model building and designing is about considering compromise. Much like John D. Rockefeller’s sentiment but it would go like this “How much closer to scale can we get it”. I don’t have an answer for that question yet but I know it is a lot of fun trying.
Petski In defense of the scale fidelity of the Showcase Miniatures/Century Foundry signals.I am not sure I understand what you mean by "But I still don't care for the visible and rather large fiber optic loop behind the target." Here is a picture of the prototype you may notice a loop of flexible conduit behind the target http://www.rrpicturearchives.net/showPicture.aspx?id=2489907 What are you talking about? Maybe you are thinking of a different type of signal. None the less I enjoy your challenging critique.JoeW.