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Trefeglwvs Road Cambrian Railways 21

Steam_Julie

Entry posted by Steam_Julie

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Hi New photograph of DCC wiring added 26-11-13

 

Since the last blog entry I have wired the scenic board, in similar fashion to the fiddleyard board. I have also wired both boards together at both track crossing points. Some people may say that this is over the top!

 

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But I remember from electronics at college, that if you have 2 resistors of value R and you connect them in series then the total resistance is 2R. However if you connect them in parallel the total resistance is 1/2R instead.

 

The main power bus is single core wire, whilst the links are multi-core cable. This allows the cable in the links to bend without damaging it. But the cable has slightly higher resistance than the solid core cable.

 

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The programming switch is arranged so that when the switch points towards the programming track, the programming track is selected, and therefore when it points away from it, the main is selected.

 

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Now after the track over the joints has been fettled, I can turn my mind back to the task of doing the scenery again.

 

Julie

 

PS An animation of running around a passenger train in the fiddleyard can be found at :-

 

http://www.rmweb.co.uk/community/index.php?/blog/1429-steam-julies-general-blog/

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MikeOxon

You are right to have parallel electrical paths, as it minimises the chance of sudden failure, though you should check, from time to time, that both parts are working, so that you don't lose the redundancy. 

 

I love that word "fettling" :)  I believe that it originally referred to cleaning up castings after they came out of the mould but is now used generally for 'cleaning things up'

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Steam_Julie

They are to support the train cassettes whilst the trains are being driven on or off them! Because of the shape of the layout, the baseboard edges cannot be used, as using them for support means that the cassette is not level across the track.

 

Julie

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Steam_Julie

Whilst I was putting the layout onto it's legs, following the wiring operations. During the wiring, the layout has been supported on my workmate. I took the opportunity to photograph the whole underside of the layout.

 

Julie

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