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The TL11 uses a small synchronous AC motor turning a cam against a comb of switch contacts. The AC motor is turned at an accurate rate by the alternating current, which power companies carefully regulate. Gears drive a shaft at the desired rate, and turn the cam. The TL11 uses a small synchronous AC motor turning a cam against a comb of switch contacts. The AC motor is turned at an accurate rate by the alternating current, which power companies carefully regulate. Gears drive a shaft at the desired rate, and turn the cam. An advantage to the mechanical design versus a completely electronic timer is that mechanical switch contacts remain more cost effective than the semiconductor timer devices needed to control devices of the same current demand. An advantage to the mechanical design versus a completely electronic timer is that mechanical switch contacts remain more cost effective than the semiconductor devices needed to control powerful lights, motors and heaters.