Atmel power control for a Lionel train
In the world of Lionel, "train power" isn't limited just to the trains themselves. Electric switches that can be thrown by remote pushbuttons (Figure 1) and uncoupling magnets (Figure 2) are the prime examples. These two devices, part of the track itself, come with the "common" wire connected to the outside rail.
Although it is possible to break this connection, often it is not practical. The accessory is designed for a button to connect the device and the inner rail, so the easiest way to activate these devices is still with the track power itself.
The accessories usually run on the same voltage levels as the track and are designed to be powered by the same throttle, but strictly speaking, track connections are not required. I try to keep them separate as much as possible.
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