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Old 31-08-2017, 01:59 PM   #41
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Thanks for all the pointers!
Everyday I think I'm getting somewhere!
But this hole keeps getting deeper, it makes me appreciate what I've seen at those two shows at a whole new level.

At least I'm getting results specific to my particular set of problems.

Honestly there's nothing like a challenge and this is certainly challenging me.
Without all of the input I've received from various members here, this idea would be dead in the water.
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Old 31-08-2017, 02:32 PM   #42
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EMI - electro magnetic interference...
Any wire that has a current passing through it produces a magnetic field which can induce a similar field,in an adjacent wire.

The practice of twisting wires in a bundle effectively cancels out these fields, but mega-bundles of straight wires can be problematic in more ways than just EMI as wires in close pro ity are unable to shed heat and can overheat to the extent of burning, e.g. early aircraft looms were so built and could fuse together in the middle of a large loom as the insulation had melted, hence nowadays they adopt rigid EMI avoidance grouping and spacing.

This is of course extreme conditions unlikely to be met on a simple model railway, but it is just good practice not to bundle too many wires together, especially where one or more wires would expect to see an aggressive flux generated, such as when a solenoid point motor fires.

The simple way out is as FB says to group like minded wires together, and to adopt the twist every now and then principle to minimise the effects. More theory than practical problems at our level.
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Old 31-08-2017, 09:20 PM   #43
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Nice lesson though! Thanks for your expertise.......
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Old 31-08-2017, 09:23 PM   #44
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Talking Master plan take 20something!

How does this look?
I skipped the droppers as I think I have that sorted!
(After every rail join)

Hopefully this is getting closer!
Also my basic switch panel plan here......
Cheers.
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Old 05-09-2017, 09:52 PM   #45
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Sorry but it's another question from me I'm afraid!
It may be a silly question?

Fusing dc
Typically a fuse is in the positive rail of a circuit.
If I reverse the track, the fuse will then be in the 0/gnd rail.

Do I fuse both lines from the controller?
My brain thinks yes......
What do you guys/girls/people do?

Cheers.
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Old 05-09-2017, 10:45 PM   #46
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Just in the one leg. Unusual to fuse track feeds though, the DC controller has overload protection built in.
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Old 09-09-2017, 04:30 PM   #47
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Cheers FB. You've almost earned a beer!

So I've been working on this.
Dc control for my point motors.
As yet unverified. If I can get it working happy days!
Based on Rob Paisley Schematics for stall motor driver and block occupancy.

Safety cut off switch so you can't throw a point with a train in the way.
Idiot proofing for my own personal protection.

If it works I'll need 3 of these boards to satisfy my layout.
It should work in theory, the basic stall motor drive appears to function ok.
Once a few components turn up, I'll breadboard it out and see what happens!


A question.
Does anybody use this type of protection, if so how many photo transistors per point?
I'm thinking at least three? (I guess it depends on the point length)
But just for a general idea......let me know cheers.
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Old 11-06-2018, 01:53 PM   #48
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Smile Hi, I think Im going to do this.

But before I order anything......

Would this present any issues re wiring.
(Reverse loops etc.)
As far as my limited knowledge can tell me;
No, it should be straightforward.

(White square to white pin=reverse loop)
Everything else.....normal rules apply.

Im just looking for confirmation.

Cheers.
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