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The CIRCUITRON AR-1 is an automatic polarity reverser that is ideally suited for use with point-to-point layouts, displays, test tracks or reverse loop setups. The AR-1 can safely switch up to 6-amp loads, making it compatible with virtually all scales. The AR-1 uses tiny Opto-Sensors mounted between the rails where they are shaded from ambient room light by a piece of rolling stock. The AR-1 requires a filtered 12-volt DC supply for proper operation. Pushbuttons may be incorporated into the circuit for manual reversing.