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AF 759 Danger Bell

2 years ago 1150
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Revised version of my 759 crossing controller

This is a controller board to make the AmericanFlyer 759/761 Danger bells do a wig-wag style of flashing and dinging. It will also control a crossing gate at the same time.

Note: The output is AC for incadedscent lamps. It is not intended to operate LED style accessories without suitable dropping resistors.

This is a heavily revised version that allows you to use a 696 track trip to activate it or an Infra Red sensor. I also added an ICSP connector to allow programming the Atmega 328 chip without removing it from the board.

It also has provisions for adding a small sound card (DY-SV8F) for bell sounds if you do not have an accessory with a bell. These are available on eBay for about $4.

There is a header with a jumper block that allows you to select either the 796 track trip or a common IR sensor board that outputs a signal when something passes in front of it. These IR sensors are commonly available on eBay for a dollar or two. Search for "IR Infrared Obstacle Avoidance Sensor Module For Arduino"

These can be mounted between the rails or better yet, in a section of rubber roadbed.

You can use the 696 or the IR board but not at the same time. You have to set a jumper to select which one.

Note: the connections on the 10 pins are different from the original version.

Pin 1= 18VAC, Pins 2345=Base Post. Pin 6=Input from 696 or IR board, Pin 7=Crossing Gate, Pin8 =Bell, Pins 9,10=flashing lights.





ID Name Designator Footprint Quantity BOM_Manufacturer Part
1 LM2596 DC-DC convertor BC1 DC-DC CONVERTOR 1 LM2596 DC-DC convertor
2 470 R5,R7,R10,R2 AXIAL-0.4 4 ?
3 10K R11,R3 AXIAL-0.4 2 ?
4 1K R12,R9 AXIAL-0.4 2 ?
5 47R R1,R4,R6,R8 AXIAL-0.4 4 ?
6 1x6 H1 HDR-TH_6P-P2.54-V 1 Header-Male-2.54_1x6
7 2P CN1,CN2,CN3,CN4,CN5 ECO SCREW TERMINAL 5.00MM 2P AAA 5 2 Pin Screw Terminal 5.08
8 1N4004 D1 DO-41 1 1N4004
9 MOC3023 U1,U2,U4,U5 DIP-6 4 MOC3023
10 .1 mfd C1,C3,C4,C6 CAP-TH_L6.5-W4.0-P5.00-D1.0 4 CBBCapacitor 330PF 100V
11 Button-6x6x6mm SW2 SW-TH_4PIN-L6.00-W6.00 1 Switch,6*6*6Plastic head,260G, 0.25mm,Straight line
12 1X3 H2 3 PIN HEADER 1 3 pin header
13 Pwr LED LED1 LED-5MM 1 5AR3UC12 800-1500
14 16Mhz X1 HC-49S 1 49S DIP Crystal insulation film
15 BR1 NO2 BRIDGE-WOB 1 2W10
17 .1 mfd C5 CAP-HV-5.0*3.0 1 101K/1KV Capacitor
18 4N33M U6 DIP-6 1 4N33M
19 22PF C2,C7 CERAMIC CAPACITOR 22PF 2 New SchematicLib
20 ICSP6_Header J1 HDR-TH_6P-P2.54-V-R2-C3-S2.54 1 Header-Male-2.54_2x3
21 BTA08 Q2,Q3,NO1,Q4 TO-220 4 BTA08-600CRG


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Comments (1)

George Cohn Reply

Note: the latest board is heavily modified.  It can use the 696 track trip as before and a crossing bell but it now has provisions to use an external sound card for the bell sounds as well as the ability to use an Infrared detector instead of the 696 track trip.

If you use the 696 track trip, set a jumper between Com and 696 on the 6 pin header.  The track trip needs to be installed on the track so it provides track power when depressed.  The Diode (D1) is now permanently connected to the Base Post.

The Pin 1 is for the fixed 15-18 volts A/C from the train transformer.  Pins 2 through 5 are Base Post and at least one needs to be connected to the Base Post on the train transformer.  The rest can be used as the BP for the flashers, bells, and crossing gate.

An IR detector can be used by moving the jumper from Com to IR.  The bottom three pins on the 6 pin header provide +5V, Ground, and the Sense or output of the IR detector.
A DY-SV8F sound card can be used by connecting it to the 3 pin header and recording a bell sound on it.  This is handy if you don't have a working bell.  The sound cards are available on places like eBay as are the IR detectors.

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