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The TC-4 is identical in function to the CIRCUITRON TC-2 above, except that the output of the TC-4 is designed to drive the CIRCUITRON TORTOISE™ Switch Machine. The TC-4 can also be used with Switchmaster™ and other brands of stall-motor switch machines that use the Hankscraft™ display motor. The TC-3 requires a 12-18volt DC input and is constructed on a 1½”x3” printed circuit board.