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The CIRCUITRON TC-3 functions exactly the same as the TC-1 above, but the output is designed to drive the CIRCUITRON TORTOISE™ Switch Machine. The TC-3 can also be used with Switchmaster™ and other brands of stall-motor switch machines that use the Hankscraft™ display motor. The TC-3 is ideal for use as a driver when pushbutton control of the TORTOISE™ is desired such as when used with diode matrix controls. The TC-3 requires a 12-18-volt DC input and is constructed on a 1½” x 3” printed circuit board.