Block Signal Controller (Single)(LED) SEE THE VIDEO DEMONSTRATION (CLICK THIS LINK) All Signal Controllers now have the ability to swap polarity to common Plus or Minus. (Anode and Cathode support) All Signal Controllers can/should be powered by 12vDC. If you plug in 12VDC, the output to the LEDs by default will be up to 11VDC but you can change that to 5V. If you have a 12VDC power bus (such as common on T-Track sections for example) you can down shift the 12v INPUT to an OUTPUT of 5VDC in order to operate and protect 3V LEDs. Built in resistors and using a PWM protects LEDS – even ones rated to 1.8v Signal Controller Manual v1.6a
