Since it seems that most practical applications of this unit would have the board at a remote location with a wire between the sensor and the board, it made sense to see if it could be smaller. Here's a 1.5" x 2.0" version, it has the same components and functionality of the earlier 2" x 3" board, just in half the space. This would likely facilitate putting it in trackside cabinets easier than the larger board. I did sacrifice the high current relay and just used the 3 amp relay, more than sufficient for signals.
