Talking Electronics

See Electronics for Model Railways Book 2!
The ultimate motor drive for proportional movement.
There are two similar circuits on the PCB, each capable of driving a servo.
It provides an adjustable pulse for driving servos. The limits of the servos travel, can simply be adjusted using the trim pots provided on the PCB and it also allows a toggle switch or a rotary switch to be used to select several adjustable preset positions, or a circuit can be arranged to do it automatically.
The Crossing Boom Control K-CBC1 can be easily modified to do the job.
Simply leave out the motor control circuit and use the contacts on the relay to switch between a pair of trimpots on the servo driver PCB (printed Circuit Board).
The possibilities are numerous. Control a set of boom gates or the older style of gate can be driven.
A Very precise operating crane could be made for loading and unloading trains. Use a servo to drive a wagon tripper of the sort that is used to empty wagons into waiting ships. A simple turn table can be made to operate from a large, heavy duty servo. Although servo's are only limited to roughly 270 degrees a little shunting may be required for a full 360 degree turning circle.
Board dimensions: 3.1in x 2.5in.