Circuitron 800-5201 DT-1 Grade Crossing Detection Unit Trees - Palm These external devices can be

These external devices can be anything that supplies an electrical connection between the input pins (1-14) and the pins marked "GND"

portal opening 1 7/16" w x 1 13/16" h

4 in3 (530 cm3)

or mix with other colors and textures to create dimension

Includes CF-1 circuit board

Circuitron 800-5201 DT-1 Grade Crossing Detection Unit Trees - Palm These external devices can beCircuitron 800 5201 DT 1 Grade Crossing Detection Unit The Circuitron DT 1 is a bi directional detection circuit designed for DC track power that provides an output whenever one of its Opto Sensors is covered by a piece of rolling stock. Absolutely no modifications to the rolling stock are necessary. 4 Opto Sensors are provided, 2 of which are used for each direction of travel. The two Opto Sensors for each direction are wired in series, and a single