About the article

Speed controller for model train

Speed controller for model train
The Type ZN419CE servo control IC from Ferranti is ideal for use in model railway direct-current engines. The internal circuit diagram of this device is shown in here. The IC varies the pulse width of input pulses in direct proportion to the displacement of a potentiometer. It operates with positive-going input pulses which can be coupled directly or via a capacitor to input pin 14. The advantage of a.c. coupling is that should a fault occur which causes the input signal to become a continuous level, the servo will remain in its last quiescent position, whereas with direct coupling the servo output arm will rotate continuously.
Downloading of this magazine article is reserved for registered users only.
Login | Register now!
Loading comments...