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This Capacitor Discharge Unit has 12vAC – 15vAC or 20vDC – 35vDC input.
The mini toggle switch is easy to mount on your panel and the indicator LEDs
show the position of the point. The screw terminals make wiring easy and you
can mount the modules side-by-side to show all your points.
The clever circuit produces very fast recharge and you only need 3 wires to each point
and a positive and negative to the module.
You can make a 36v power supply very cheaply by combining a 24v and 12v wall wart as shown in the image above. More details on using this is on the Talking Electronics .com website.
And you get a length of twin wire to connect the module to your power supply with 4 quick-connect terminal blocks as shown in the image above.
Fully built and tested for $10.50 plus $6.50 postage. This is the lowest cost Capacitor Discharge Unit with all these features.
This CDU now comes as 2-modules with a face place and 5 modules with a face plate.
This module requires 25v supply and to get the required energy to change a point, the electrolytics are 2,200u.
You can mount 2 or 5 modules “side-by-side” and use the face-plate shown in the photo below to connect them together and fit them to your console.
Here’s what you need:
1 – faceplate $2.00
1 – power supply module $5.50
1 – switch module $5.00
1 – switch module $5.00
1 – switch module $5.00
1 – switch module $5.00
1 – switch module $5.00
You can operate 5 points for a total of $32.50 and that is less than $7 per point.
The face-plate means there is no drilling needed and a simple cut-out in your console will allow the face plate to be added.
Now with new LARGER face-plate and track ID 2-module face-plate $2.00 or 5-module face-plate $3.50
The circuit for the 5-Modules version has 2 x 2,200u electrolytics in the power supply section because the charging of the 2,200u (in the second part of the circuit shown above), when the switch is in the “MAIN” position, will take a lot of energy from the 2,200u in the power supply and the voltage across it will dip 50% (theoretically). When 5 modules are connected to the power supply, this will be passed to the other modules and affect the operation of the other points at a time when they should not be affected.
To prevent this we have used two 2,200u electrolytics in the power supply. The voltage will theoretically drop 30% but the other points are not affected.
You will need to contact Colin Mitchell: talking at tpg.com.au for all the details of costing and posting before ordering.
Talking Electronics .com
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Category: Collectables:Model Railways and Trains:Power and Control:Control accessories
Location: Dingley