See Electronics for Model Railways Book 1!
Can switch any number of model train points or solenoids, one at a
time.
Supplies a high current 'burst' to the solenoids.
This unit will discourage problems like: drawing the max current from
your main power supply, it will not allow 'back emf' and high currents
to damage switches, and it won't heat up solenoids left "in-circuit".
The onboard LED will light when the unit is ready. When a point is
operated by a momentary push button on the control panel, the LED will
extinguish and come back on as the capacitor charges.
Board dimensions: 2.1in x 1.2in.