SIGM20: What signals can I use?

It is able to represent the following kinds of signal:

  • 4 aspect: these are typical of UK main line signalling with red, amber, double amber & green aspects;
  • 3 Aspect: widely used everywhere with red, amber, green aspects;
  • 3 aspect with flashing amber state: typical of US practice
  • 2 aspect, used on minor lines only.

In European signalling practice, separate "distant" signals are common. The SIGM20 can drive one "distant" signal type, with the signal becoming dark (no LEDs lit) if the "main" signal on the mast is green.

The board can drive model signals that have LEDs wired in both common cathode and common anode arrangements. It can also drive "searchlight" signals that have one visible lamp that can adopt red, amber or green aspects using bi-colour LEDs.