Twin Coil Switch Machine Driver Circuit (PCB)

For: Atlas, Pico & RIX Machines

  The Twin Coil Switch Machine Driver Circuit allows a SPDT or DPDT toggle switch to control Twin Coil switch machine motors that have separate or common connected coils.

  The handle of the toggle switch can used to indicate the selected route through the turnout.

  The circuit can also control LEDs that can indicate the selected route. The LEDs turn off instantly when the toggle switch is thrown.

  Using the parts values shown below, a turnout can be reversed about every 4 seconds.

A printed circuit board and parts are available for this circuit.

Click On The Picture For A Larger Image.

email

  If you are interested in printed circuit boards please send an email to the following address: rpaisley4@cogeco.ca Subject: Twin Coil Switch Machine Driver

  This circuit board can also be used to drive Single Coil Switch machines.

  Original Twin Coil switch machine driver circuits page.


Basic Twin Coil Driver Circuits

  The next two diagrams show the basic circuits for the Twin Coil Switch Machine Driver circuits. Each printed circuit board has 7 driver circuits on it.

Common Connected Switch Machine Coils

Separately Connected Switch Machine Coils


Twin Coil Switch Machine Driver Circuit Notes


  The direction indicator LEDs are optional, they can be omitted as shown in the next schematic. If indicator LEDs are not needed, R1 and R2, D1 and D2 as well as 2 terminal block positions can be omitted from the circuit board as well.


Full PCB Circuit

  The next schematic shows the complete, 7 driver circuit of the circuit board and examples of the switch machine circuit.

Multiple Location Control For Twin Coil Switch Machines



Twin Coil Switch Machine Driver Printed Circuit Boards

  Twin Coil Switch Machine Driver circuit boards sold = 13.

  A printed circuit board is available for this circuit. There are 7 identical single coil switch machine drivers on each board.

  The following is an image of the circuit board which is 2 inches by 9 inches and is drilled to fit terminal blocks with a 3.5mm pin spacing.

Click On The Picture For A Larger Image.

Switch Machine Driver circuit boards sold = 11.

  The board has been commercially made and is tinned.


Option 1

  Twin Coil Driver circuit boards only:

  17.00 dollars US each for 1 or 2 circuit boards.

  16.00 dollars US for each additional circuit board.

  Plus postage.

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Option 2

  Twin Coil Driver circuit boards with all parts:

  43.00 dollars US each.

  Plus postage.

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Option 3

  Assembled - Twin Coil Driver circuit boards with all parts:

  46.00 dollars US each.

  Plus postage.

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email

  If you are interested in printed circuit boards please send an email to the following address: rpaisley4@cogeco.ca Subject: Twin Coil Switch Machine Driver

  Your message will be answered as soon as possible.


PCB Parts List

  The following is a suggested parts list for the Twin Coil Switch Machine Driver's circuit board.

  1N4001 diodes can be used in place of the 1N4148 diodes.

Part Qty. Description DigiKey Part #
D1, 2 14 1N4148 Diode 1N4148FS-ND
D3, 4 14 1N4001 Diode 1N4001FSCT-ND
R1, 2 14 2.2K OHM 1/4W Resistor 2.2KQBK-ND
R3, 4 14 1K OHM 1/2W Resistor 1.0KH-ND
C1, 2 14 2,200uF 25V Aluminum Electrolytic P5157-ND
TB 9 2 Position Terminal Block - 3.5mm ED2635-ND
TB 7 3 Position Terminal Block - 3.5mm ED2636-ND

  9 of the 2 position terminal blocks are shown in the parts list but only 8 are actually required as there are power supply connections at both ends of the circuit board.

Part Qty. Alternate Terminal Blocks DigiKey Part #
TB 2 2 Position Terminal Block - 3.5mm ED2635-ND
TB 7 5 Position Terminal Block - 3.5mm ED2638-ND

  Anti-Ringing Diodes are not required for this circuit.

  2 of the 2 position terminal blocks are shown are listed but only 1 is actually required as there are power supply connections at both ends of the circuit board.

  T42-1 Push-In Terminals Push-In Terminals can be substituted for the terminal blocks or wires can be soldered directly to the circuit board to reduce costs if desired.


Parts Placement Diagram


Driver Circuit Block Diagrams

  The next diagram shows the PCB circuit only. This diagram can be used as connection diagram to aid in wiring the drivers.


  For other information on other Capacitor Discharge type switch machine power supplies see: Basic Capacitor Discharge - switch machine power supplies.


Adding A Relay To The Circuit

  The next diagram shows how connect a 12 volt relay to the circuit. The relay could be used to control frog or block power if needed.

Resistance, Capacitance, Voltage And Time Calculator


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Please Read Before Using These Circuit Ideas

  The explanations for the circuits on these pages cannot hope to cover every situation on every layout. For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches.

  If you use any of these circuit ideas, ask your parts supplier for a copy of the manufacturers data sheets for any components that you have not used before. These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves. These data sheets can often be found on the web site of the device manufacturers.

  Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others. If you have any questions or comments please send them to the email address on the Circuit Index page.

email

  If you are interested in printed circuit boards please send an email to the following address: rpaisley4@cogeco.ca Subject: Twin Coil Switch Machine Driver

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23 December, 2016