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The CIRCUITRON SD-1 provides all the logic and output drivers to control any 3 lamp, 3 color Block Signal or multiple lamp Position Light Signal. The three outputs on the SD-1 can each control a maximum of 250 ma. and they will power either LED or incandescent lamp type signals. If your signals use LEDs, make certain that they are connected with a
common positive (anode) connection of all LEDs (the signal should have 4 wires, and the “common” connection should go to [+]. Most, but not all, signal manufacturers follow this design. Detection circuits (such as the CIRCUITRON BD-1, BD-2 or BD-3) that provide a logic low (- or ground) output are needed for a minimum of 2 blocks to display all three aspects. The SD-1 is constructed on a 2” x 3” printed circuit board and requires a 10 - 18-volt DC input for proper operation.
common positive (anode) connection of all LEDs (the signal should have 4 wires, and the “common” connection should go to [+]. Most, but not all, signal manufacturers follow this design. Detection circuits (such as the CIRCUITRON BD-1, BD-2 or BD-3) that provide a logic low (- or ground) output are needed for a minimum of 2 blocks to display all three aspects. The SD-1 is constructed on a 2” x 3” printed circuit board and requires a 10 - 18-volt DC input for proper operation.