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556 Timer Stall-Motor Switch Machine Drivers

556 Timer Stall-Motor Switch Machine Drivers

The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. The circuits use LM556 dual timer chips to provide a PUSH-PULL output to reverse the polarity of the supply to the switch machine motors.
The 556 timers provide a logic function equivalent to a SET / RESET type Flip-Flop. This gives the circuit a memory function that allows the turnout to remain in its last position when the input push button switches are open.



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The switch machine used to develop these circuits is the Circuitron Tortoise™ slow motion type switch machine (Model number 800-6000). Other makes of stall motor switch machine should also work with this type of circuit.

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