Circuitron 5501 BD-1 Block Occupancy Detector Opto-Electronic

The CIRCUITRON BD-1 is an advanced, integrated circuit design Block Occupancy Detector utilizing our proven Opto-Electronic design which provides positive indication whenever a block-section of a layout is occupied by any piece of rolling stock. Two pair of CIRCUITRON OptoSensors (included) are mounted between the ties at the end points of the block that is to be protected. Any piece of rolling stock entering the block shades the Opto-Sensors from ambient room light which activates the logic circuitry on the BD-1 circuit board. No modifications to rolling stock are necessary. The BD-1 is bidirectional and will give proper indications even if a train leaves a block by reversing direction and backing out. The CIRCUITRON BD-1 also contains driver circuitry sufficient to power a pair of two-color LED (including 2 lead Bi-Color LEDs) or incandescent lamp block signals at each end of the protected block (LED-type signals must be wired with a common anode [+] configuration). The outputs on the BD-1 can control a maximum of 250 ma. For 3- color signaling, additional signal drivers will be necessary (see our SD-x series of drivers later in this section). The BD-1 requires a 10-18 volt DC input for proper operation. The power supply should be filtered for proper operation. If you do not have a filtered power supply, the CIRCUITRON PS-1 filtered AC to DC Converter or PS-2 Regulated AC to DC Converter are ideal for this application. The BD-1 is constructed on a 2? x 3? printed circuit board. The BD-1HD is identical to the BD-1 but includes heavy duty output transistors to power lamps in large scale signals. Each output on the BD-1HD can control 500 ma.