This file, from 2014, contains Ray's version 5 of his switch machine circuit. It is of particular use to Kato Unitrack users, providing a panel switch w/ LED lighting mechanisms
Ray (George Ray Stilwell, Jr) used to ask that this file not be made available on line, but only via email from him. As he has passed away, I have made this version available on TrainBoard as a resource.
G Ray Stilwell BCD Circuit 5.0
Ray Stilwell's Instant Charge Bipolar Switch Machine control circuit