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Capacitor Discharge Unit |
Talking Electronics has produced a Capacitor Discharge
Unit controlled by a standard toggle switch.
See the wiring diagram below to connect the switch, point motor
and power to the PC board.
This project puts no load on your power supply and prevents the
point motor burning out.
The board also has indicator LEDs to show the position of the
points.
All the components fit on the PC
board and the project comes with 2 x 1,000u electrolytics. If your
supply is less than 12v - 15v AC, you will need 2 x
2,200u - if your supply is say 12v to 14v DC.
CONSTRUCTION
All the parts fit neatly on the PC board.
The transistors, diodes, electrolytics and LEDs are identified above and
the diagrams show how they are fitted to the board.
The screw terminals allow the board to be easily connected to your power
supply via leads into the 2-connector block and the point motor as well
as the switch, without the need for any additional soldering.
You can use a PECO PL-23 switch, but a toggle switch is MUCH cheaper.
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PARTS LIST |
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1 - 100R 1 - 330R 3 - 1k 2 - 2k2 2 - 4k7 2 - 10u 25v electrolytics 1 - 100u 25v electrolytic 2 - 1,000u 25v - 35v. (see text for 2,200u) 4 - 1N 4004 diodes 3 - 3mm red LEDs 2 - BD 679 Darlington transistors 1 - 2-Connector terminal strip 2 - 3-Connector terminal strip 1 - Capacitor Discharge Unit (using switch) PC Board Extras: You can get 2 x 2,200 electrolytics in place of the 2 x 1,000u for $3.00 extra Extras - not in kit: 1 - SPDT toggle switch 1 - Point Motor |
26-4-2014