Model Railroad Control Systems
Model Railroad Control Systems

MRCS-Morse-Code-Buzzer

Fork project on GitHub

Morse Code Buzzer Board

 

 

MRCS-Morse-Code-Buzzer Version 3.0

First built: 2017-08

v3.0 20170815

Schematic
Schematic
Bot Silk
Bot Silk
Board
Board
Top Silk
Top Silk

Download MRCS-Morse-Code-Buzzer - CHMT Component and feeder definitions
Download MRCS-Morse-Code-Buzzer.gerbers.zip - Gerber Fabrication files
Download MRCS-Morse-Code-Buzzer.parts - Parts List (spreadsheet data)

 

MRCS-Morse-Code-Buzzer.bom

Parts Value Package Quantity Library Type/Feeder
R1, R2 4.7K AXIAL-0.4-RES 2x SPCoast PTH
U$4 6-12vDC PWR_LABEL 1x SPCoast PTH
C2 100 uF @ 50V E3.5-10 1x SPCoast PTH
J1, J2 1751264 1751264 2x mschutzer PTH
RX1, TX0   1X02 2x SPCoast PTH
U$1   BOARD-DINRAIL-2.71IN-MRCS 1x SPCoast PTH
U$3   CA-PROP65-BACK 1x SPCoast PTH
C1 .1 uF @ 50V C025-030X050 1x rcl PTH
U$2 ARDUINO_PRO_MINI ARDUINO_PRO_MINI 1x SparkFun-Boards-modified PTH
CON5 load ground + supply MSTB2 1x SPCoast PTH
CON3 Power DCJ0202 1x SPCoast PTH
CON4 Power MSTB2 1x SPCoast PTH
CON1 Start (called) Leads 1X08_LOCK 1x SPCoast PTH
CON2 Stop (Off-Hook) Leads 1X08_LOCK 1x SPCoast PTH
IC1 ULN2803 DIL18 1x uln-udn PTH

MRCS-Morse-Code-Buzzer Version 3.0-4-g8f284be

First built: 2017-08

v3.0 20170815

Schematic
Schematic
Bot Silk
Bot Silk
Board
Board
Top Silk
Top Silk

Download MRCS-Morse-Code-Buzzer - CHMT Component and feeder definitions
Download MRCS-Morse-Code-Buzzer.gerbers.zip - Gerber Fabrication files
Download MRCS-Morse-Code-Buzzer.parts - Parts List (spreadsheet data)

 

MRCS-Morse-Code-Buzzer.bom

Parts Value Package Quantity Library Type/Feeder
R1, R2 4.7K AXIAL-0.4-RES 2x SPCoast PTH
U$4 6-12vDC PWR_LABEL 1x SPCoast PTH
C2 100 uF @ 50V E3.5-10 1x SPCoast PTH
J1, J2 1751264 1751264 2x mschutzer PTH
RX1, TX0   1X02 2x SPCoast PTH
U$1   BOARD-DINRAIL-2.71IN-MRCS 1x SPCoast PTH
U$3   CA-PROP65-BACK 1x SPCoast PTH
C1 .1 uF @ 50V C025-030X050 1x rcl PTH
U$2 ARDUINO_PRO_MINI ARDUINO_PRO_MINI 1x SparkFun-Boards-modified PTH
CON5 load ground + supply MSTB2 1x SPCoast PTH
CON3 Power DCJ0202 1x SPCoast PTH
CON4 Power MSTB2 1x SPCoast PTH
CON1 Start (called) Leads 1X08_LOCK 1x SPCoast PTH
CON2 Stop (Off-Hook) Leads 1X08_LOCK 1x SPCoast PTH
IC1 ULN2803 DIL18 1x uln-udn PTH

Documentation

On many operations-oriented model railroads, particularly those which a time-table and train-order (TT&TO) or tower-based dispatching system, there is a need to provide telephone communications between the dispatcher and the agent/operators. However, even on fairly large model railroads with multiple agent/operators, the physical distances between the operator positions are often insufficient to allow the operators to reliably distinguish that “hey that’s my phone ringing.”

The Morse Code Buzzer Controller board controls up to seven stations, tapping out each ringing station’s Telegraph code in Railroad Morse. An additional output can be designated an “ambience” buzzer that will randomly play one of several canned messages. These could be train orders, news reports, or “inside jokes”

The board accepts a push button input, stops when the phone goes off-hook (phone must have a suitable contact to provide an isolated ground) and will drive loads of up to 0.5 Amp at up to 48 Volts DC. All buzzer/sounder devices must use the same supply. Sounders must have have a coil resistance of greater than 40 ohms if using a 12V supply.

Requires a 6-9 VDC power supply rated at at least 0.5A. not included.

The on-board Arduino Pro-Mini runs the “station buzzers” sketch by Steve Williams.

doc

On many operations-oriented model railroads, particularly those which a time-table and train-order (TT&TO) or tower-based dispatching system, there is a need to provide telephone communications between the dispatcher and the agent/operators. However, even on fairly large model railroads with multiple agent/operators, the physical distances between the operator positions are often insufficient to allow the operators to reliably distinguish that “hey that’s my phone ringing.”

The Morse Code Buzzer Controller board controls up to seven stations, tapping out each ringing station’s Telegraph code in Railroad Morse. An additional output can be designated an “ambience” buzzer that will randomly play one of several canned messages. These could be train orders, news reports, or “inside jokes”

The board accepts a push button input, stops when the phone goes off-hook (phone must have a suitable contact to provide an isolated ground) and will drive loads of up to 0.5 Amp at up to 48 Volts DC. All buzzer/sounder devices must use the same supply. Sounders must have have a coil resistance of greater than 40 ohms if using a 12V supply.

Requires a 6-9 VDC power supply rated at at least 0.5A. not included.

The on-board Arduino Pro-Mini runs the “station buzzers” sketch by Steve Williams.

This technical documentation is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike