SD-2 THREE POSITION SEMAPHORE DRIVER
The SD-2 Semaphore Driver is designed for use with the CIRCUITRON TORTOISE™ and an upper or lower quadrant semaphore style signal. NOTE: Neither the TORTOISE™, the signal nor the signal linkage are included. See CIRCUITRON’s Remote Signal Activator Kit on Page 35 . The SD-2 provides all the logic circuitry necessary to drive the signal to all three positions, and is designed to work with CIRCUITRON BD-1, BD-2 or BD-3 Block Occupancy Detectors. Other detection circuits that provide a logic low (- or ground) output may also be used. A minimum of 2 blocks must have detectors installed to allow 3 position indications. The SD-2 measures 2” x 3” and requires a 10-18 volt DC power source for proper operation
 
Although CIRCUITRON Block Occupancy Detectors can directly control 2-color block signals without any additional logic or drivers necessary, whenever you want to connect prototypical 3-color signals, you must have a driver circuit for each signal which will accept the outputs from the “home” and “following” block detectors and translate this information to drive the signal to the proper aspect. CIRCUITRON has driver circuits available for nearly all popular signal types including single and dual head searchlight with Bi-color or Tricolor Light Emitting Diodes, color light signals of any configuration (type D, type G, etc.), position light signals (Pennsylvania, Norfolk & Western, etc.) and color position light signals (B & O). We also have a semaphore driver to be used in conjunction with the CIRCUITRON TORTOISE™ Slow Motion Switch Machine.
 
800-5520 SD-2 SEMAPHORE DRIVER
MSRP $29.95