GCA99 2-Rail current detection

The problem

If you are using a 2-Rail system with current detection you must make sure that all surrounding tracks have the same voltage level as the detection section.
This will trigger an event as soon as the first current drawing wheel set touches the isolated detection track.
In all other cases the event will come only after the whole locomotive is on the isolated track. This could be too late under certain conditions.

The solution

Use a dummy detection unit for all surrounding tracks:
2rail-dummy-detect.jpg

Example of how to wire the tracks:

The sensor event will only occur after the locomotive is completely on the sensor track if the dummy is left out.

The Printed circuit

The previous picture , shows a rough solution to make this printed circuit.

Here are some files to make the real PCB.

mgv99.pdf the PCB

mgv99sch.pdf The schematic


Personal Tools