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cliff park

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    : Great Yarmouth

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  1. It seems to me that railway electronics, in fact electronics in general, have moved on an awful long way since the Roger Amos books were published. They will, of course, give you a good grounding. And all the information is correct, and still works. But so much has changed. As a retired electronics engineer I can say one of the biggest challenges of the job was keeping up to date in a fast changing world. We used to say that we would get a mass of new equipment, teach ourselves how to make it work and maintain it over the next year, then we would get training on how to maintain it, then 6 months later it would be replaced with something new and we start all over again.
  2. Potentiometer is correct, to add to dictionary right click on word and select 'add to dictionary', it will never fail again. Works well with frequently used names that keep getting flagged.
  3. So 50Hz as the frequency, presumably mains derived. Then drive it all one way to produce a sort of DC, actually almost identical to rectified AC with no smoothing. But why ? Seems an awful lot of effort to achieve......what ?
  4. There are plenty of 2 pole 3 way slide switches, quite cheap. They have the advantage of being able to see at a glance which controller the road is set to. The advantage of rotary or slide switches is that you can never accidentally switch to 2 controllers at once.
  5. Audio jack plugs are ok if good quality, but they have a really small contact area, particularly the tip connection. I've known them to get warm handling high speaker currents.
  6. There are some cheap tow bar plugs and sockets, the plastic versions. 7 or 13 pin, obviously robust and meant to be plugged/unplugged frequently. They start at about £3.00 each . The other advantage is any you buy, now or in the future will fit, long term standard.
  7. After it has tripped will the loco run straightaway, or do you have to wait for it to 'cool down' before it will run again ?
  8. Effectively the latching relay has two coils, a bit like the solenoid, so it latches either way. Each push button (the red ones) does two things:- it operates the solenoid and operates the relay, one way or the other. The contacts of the relay then switch the current to the rails. (Although I believe there is an error in one of the c/o connections, the top set lever spring is connected wrong)
  9. How about approaching it from a slightly simpler direction. control the speed within the engine, ie a resistor in series with the motor circuit inside the engine, fitted to just the freight engines. The problems that spring to mind in 2mm is physical size, and getting the Ω right .
  10. A device to change DC to a different DC is called an inverter. It normally works along the lines of an oscillator to chop up the DC voltage, feed that through a transformer ( Chopped up dc looks a lot like AC, albeit square wave) then rectify the resultant AC to produce DC, then smooth it and voila. Another way is to use the DC to turn a motor, and use this to drive an alternator, push the resultant AC through a transformer, then rectify............etc. These techniques are really for high power DC to DC, especially the second one. Of course with modern miniature electronics the whole thing can be much smaller, but the same principles still apply
  11. One small point if going for the file method. Normally when using a file by hand, every (nearly every) tooth on the file passes over the object being filed. If the file is held against a revolving wheel, and is not moved one tooth will do all the cutting, become dull and clogged up. It is important to move the file backwards and forwards slowly, and use a wire brush on it frequently.
  12. OK totally off topic, the French for tyre is pneu, pronounced like gnu. I wrecked a tyre in France, on a Mercedes, and had a real problem finding a replacement. My wife and I spent 2 days driving from one tyre shop to another with me singing (think of Flanders and Swan) " I need a pneu, a pnother pneu". My wife was not amused.
  13. Can I go slightly off topic and ask :- If I have an engine in my hand how can I tell if it has a coreless motor?
  14. Also, it is possible to get releasable cable ties. The 'tongue' is longer than normal and a finger nail, or small screwdriver will release them
  15. That doesn't work when you are retired
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