The 129364-01 Printed Circuit Board (PCB) by Allen-Bradley is a Servo Drive PCB. This circuit board is designed to aid in driving the small servo motors, which are frequently used in small devices like radio-controlled cars as well as radio-controlled airplanes. These servo motors are commonly known for being switch machine motors that are used in model railroads since they are relatively low-priced. Additionally, they are popular for small robots. The 129364-01 PCB, as well as other similar Servo Drive circuit boards, enables the users to test servos without using a microcontroller device or a PC. These circuits use 556 timers to help in the generation of control pulses and allow the potentiometers to adjust their pulse widths.

When using the 129364-01 Servo Drive PCB, there is no need for computer-based programming. Also, the external controls can include potentiometers, toggle switches, or inputs from other circuits. The servo motors used with the 129364-01 Servo Drive PCB can help with the control of semaphore signals and turnouts as well as other animations. A single driver can be used to control 1 or more servo such as crossover turnouts. Each servo drive circuit controls the servo motors in 3 different modes depending on the configuration of its input terminal. The modes include the 2 fixed positions, 3 fixed positions, and variable positions. modes The rotation arc of the motor can be adjusted to about 90 degrees on each side of the center for up to a total of 180 degrees. Most typical RC servo applications use 45 degrees of rotation with up to 90 degrees total from their limit center.