The main power supply to the system must be a regulated 12 volts DC with a minimum input from the train control AC or DC power supply of 13.5 VAC connected to pos 3 and 4 of the rectifier bridge . The ground bus of the regulated 12 volts supply must be connected to the system ground ,
The independent speed reference voltage is taken directly from the train speed control module or can be taken by connecting directly from the tracks to positions 5 and 6 of the rectifier bridge .The output of this bridge will always be a positive speed voltage signal whichever direction the train is going.
The op-amp used is a FET input type ( TL071) for minimum offset voltage without having to use a zero offset voltage circuit . The offset voltage for the 741 was found to be much too high at 2.3v while the TL071 average offset of 1.15 volts was ideal to ma
11 Trackmaster Thomas The Train Trains On 11 Kids Toy Train Track Circuits Some R/C thomas The Tank
LBS2x Model Railroad ABS Block Signal Detection System for Scale Train Layouts
Trackmaster 16 Engines on 16 Circuits Thomas The Tank Engine Toy Train Set Kids Toy Train Set