2011 - Grade Crossing Circuit

Schematics, Parts Lists and Placement Diagrams



Flashers And Crossing Gate Control Schematic

  The following schematic is for the complete 2011 Grade Crossing circuit for a single track crossing. All of the components needed for both the flashers and gate control are included on this schematic.

  Options for the signal lights, sound circuits and gate drive motors are shown on other diagrams on the circuit board's main page.

  WARNING - If the polarity of the power supply for this circuit is reversed or the circuit is connected to an to an AC or DCC source, the circuit will be damaged. The maximum supply voltage is 15 Volts DC.

Flashers And Gates Circuit Board Photograph

Flashers And Gates Circuit Board Parts Placement Diagram

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Flashers and Gates Circuit Parts List

Qty   Circuit Part Number - Gates   Part Type   Digi-Key Number
2 - IC 1, 2 - LM339 - LM339NFS-ND
2 - IC 3, 4 - LM556 - LM556CNFS-ND
6 - D1, 2, 3, 4, 5, 6 - 1N4148 - 1N4148DICT-ND
6 - Q1, 2, 3, 4, 5, 6 - PHOTOTRANSISTORS - 160-1988-ND
- - - - - - -
1 - Q7 - 2N3904 - 2N3904FS-ND
1 - Q8 - 2N3906 - 2N3906FS-ND
- - - - - - -
1 - C1 - 100uF - P5152-ND
1 - C2 - 2.2uF - P5175-ND
1 - C3 - 4.7uF - P5177-ND
4 - C4, 6, 9,10 - 1.0uF - P5174-ND
1 - C5 - 10uF - P5178-ND
2 - C7, 8 - 22uF - P5179-ND
- - - - - - -
6 - R1, 2, 3, 4, 5, 8 - 1M - 1.0MQBK-ND
5 - R6, 7, 9, 15, 17 - 33K - 33KQBK-ND
2 - R10, 24 - 100K - 100KQBK-ND
7 - R11, 12, 13, 19, 20, 22, 25 - 10K - 10KQBK-ND
2 - R14, 21 - 2.2K - 2.2KQBK-ND
3 - R16, 18, 23 - 1 MEG POT - 3306F-105-ND
- - - - - - -
4 - Terminal Block - 2 Position, 5mm. - ED1623-ND
2 - Terminal Block - 3 Position, 5mm. - ED1624-ND

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Flashers Only Grade Crossing Schematic

  The following schematic is for the 2011 Grade Crossing circuit for a single track crossing. Only the components needed for the flashers are included in this schematic.

  Options for the signal lights, sound circuits and gate drive motors are shown on other diagrams.

  WARNING - If the polarity of the power supply for this circuit is reversed or the circuit is connected to an to an AC or DCC source, the circuit will be damaged. The maximum supply voltage is 15 Volts DC.

Flashers Only Circuit Board Photograph

Flashers Only Circuit Parts Placement Diagram

Flashers Only Circuit Parts List

Qty   Circuit Part Number - Flashers   Part Type   Digi-Key Number
2 - IC 1, 2 - LM339 - LM339NFS-ND
1 - IC 4 - LM556 - LM556CNFS-ND
3 - D1, 2, 3 - 1N4148 - 1N4148DICT-ND
6 - Q1, 2, 3, 4, 5, 6 - PHOTOTRANSISTORS - 160-1988-ND
- - - - - - -
1 - Q7 - 2N3904 - 2N3904FS-ND
1 - Q8 - 2N3906 - 2N3906FS-ND
- - - - - - -
1 - C1 - 100uF - P5152-ND
1 - C2 - 2.2uF - P5175-ND
1 - C3 - 4.7uF - P5177-ND
3 - C4, 6, 9 - 1.0uF - P5174-ND
1 - C5 - 10uF - P5178-ND
- - - - - - -
6 - R1, 2, 3, 4, 5, 8 - 1M - 1.0MQBK-ND
3 - R6, 7, 9 - 33K - 33KQBK-ND
4 - R10 - 100K - 100KQBK-ND
5 - R11, 12, 13, 22, 25 - 10K - 10KQBK-ND
2 - R14, 21 - 2.2K - 2.2KQBK-ND
1 - R23 - 1 MEG POT - 3306F-105-ND
- - - - - - -
3 - Terminal Block - 2 Position, 5mm. - ED1623-ND
2 - Terminal Block - 3 Position, 5mm. - ED1624-ND



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Controls Only Grade Crossing Schematic

  The following schematic is for the 2011 Grade Crossing circuit for a single track crossing. Only the components needed to control another circuit board are included in this schematic.

  WARNING - If the polarity of the power supply for this circuit is reversed or the circuit is connected to an to an AC or DCC source, the circuit will be damaged. The maximum supply voltage is 15 Volts DC.

Controls Only Circuit Board Photograph

Controls Only Circuit Parts Placement Diagram

Controls Only Circuit Parts List

Qty   Circuit Part Number - Control   Part Type   Digi-Key Number
2 - IC 1, 2 - LM339 - LM339NFS-ND
3 - D1, 2, 3 - 1N4148 - 1N4148DICT-ND
6 - Q1, 2, 3, 4, 5, 6 - PHOTOTRANSISTORS - 160-1988-ND
- - - - - - -
1 - Q7 - 2N3904 - 2N3904FS-ND
1 - Q8 - 2N3906 - 2N3906FS-ND
- - - - - - -
1 - C1 - 100uF - P5152-ND
1 - C2 - 2.2uF - P5175-ND
1 - C3 - 4.7uF - P5177-ND
3 - C4, 6, 9 - 1.0uF - P5174-ND
1 - C5 - 10uF - P5178-ND
- - - - - - -
6 - R1, 2, 3, 4, 5, 8 - 1M - 1.0MQBK-ND
3 - R6, 7, 9 - 33K - 33KQBK-ND
1 - R10 - 100K - 100KQBK-ND
3 - R11, 12, 13 - 10K - 10KQBK-ND
2 - R14, 21 - 2.2K - 2.2KQBK-ND
- - - - - - -
3 - Terminal Block - 2 Position, 5mm. - ED1623-ND
2 - Terminal Block - 3 Position, 5mm. - ED1624-ND


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Circuit Board Assembly

  When installing the components on the circuit board start with parts with the lowest height and work up to the tallest parts. For example starting with the jumper wires then diodes then resistors, IC's, transistors, capacitors and terminal blocks.



Recommended Tools

Soldering

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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.

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30 September, 2012