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Model Railroad Control Systems

Telephone Connector Version 2.1


Telephone Connector Version 2.1

0.20 LBS
Calculated at checkout

Product Description

This board provides connectors to extend the MRCS power and phone bus (used by the EBF31A Battery Feed and ATSN Dispatcher/Operator Boards) to as many as 12 stations. Pads are provided for a bucking converter to develop 12VDC for buzzers, LEDs and Relay Latches.

Version 2.1 has pads for a 5A schottky diode to handle higher current loads than the smaller one used previously. This is overkill, but a friend gave me a life time supply. Pads for the SD103A-TR are still provided.

I’ve been developing a series of circuit boards to perform the various functions needed to build a layout phone system, but I never made a central board to distribute the phone line and auxiliary power. In the past I assumed the user would use either telephone style “66 blocks” or barrier strips to distribute these signals, but that has become a road block for some users, so this board, with its on board screw terminals, puts the basic connections in one place.


  • Takes power from the 6-conductor modular telephone and +24V power bus (note to phone people: this is positive 24 to keep things simple for non-phone model railroaders)
  • Two 6 conductor Jacks are provided for daisy chaining the bus. Connectors are oriented with the locking tab up for easy connection and disconnection.
  • Connector pads provide up to 12 connections on 0.100 centers for Tip, Ring, +12 and Ground. (If you are assembling your own board and need less connections, you can use terminals with fewer positions)
  • Optional auxiliary 6 position screw terminal brings all lines on the bus out for easy access
  • Polarity protection diode protects against use of non-reversing (DCC Bus 6 conductor cable)
  • Pads for LM2596 bucking converter: provides 12V for buzzers, LEDs and Relay Latches etc.

Technical documentation including EAGLE CAD files and Instructions can be found on my GitHub Page


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