MER Clinic: Dwarf Signals

Learn how to make a dwarf signal with a LED (Light Emitting Diode) that s only .1 inch wide (8.7 inch in HO). The LEDs we use are nice because the light from the individual chips light up the whole circle. This means that in addition to green and red, they make a quite nice yellow if both the red and green are turned on. They also come in a green-yellow version, which can be used on the main line approach track and two red-green on the main and side tracks.

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