Circuitron 5510 SD-1 Signal Driver

SD-1 Signal Driver Logic and output drivers to control any 3-lamp, 3-color block signal. Will power LED or lamp-type signals. LED-type requires common positive (anode) connection of all LEDs. Detection circuits (such as BD-1) are needed for a minimum of three blocks to display all three aspects. Features All scales Drives LEDs or Incandescent Lamps 10-18 volt DC input