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AndyID

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AndyID last won the day on July 15 2020

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  1. As Kevin says it's the ampere-turns that produce the torque for a given magnetic circuit and that's a function of the cross sectional area of the winding regardless of the wire gauge. Changing the wire gauge lets you alter the motor's operating voltage but not the torque produced.
  2. Hi Tom, I've never actually tried it but it should be possible to apply a high voltage pulse to the track to start conduction. It would not do the caps any harm as long as the pulse was of short duration and fed from a high impedance source (through a resistor). Of course the best solution is to stick batteries in everything and either use radio control or send a control signal through the track. The supercap flywheel idea is a bit of a cheap and cheerful compromise Cheers, Andy
  3. Hi Johnathan, Mind how you go with those numbers from Peco. I happened to notice an error in the Code 83 numbers. The metric and imperial numbers don't agree with each other for the B dimension. I would assume the metric value is correct and the conversion to imperial has an error but it could be the other way round There may be other errors too. Cheers, Andy
  4. I agree. A 25V cap is likely to overheat and possibly explode.
  5. Hi Tom, Whether it would be worth the extra complexity probably depends on the type of layout. Feedback helps to maintain speed when the load changes due to curves and gradients. It's probably of little benefit on a level, linear sort of layout with decent power distribution. It could be done with a micro controller but it would also be possible to do it with a purely analog circuit although that would still be more complicated than a basic controller. It's also possible to do it with an analog circuit that continuously senses the current and modifies the ou
  6. Hi Tom, Yes some sort of protection would be a good idea. Zeners or maybe just a current limiter at the controller. Feedback in the usual form would not work but I don't think there would be any adverse effects if the controller did have a feedback feature. There is another way to implement feedback by sensing the capacitor's discharge rate when the current from the controller is interrupted but that would require a special controller. Cheers, Andy
  7. If the controller has back-EMF sensing it can determine the loco's speed. There are other ways to do it too
  8. Hi Tom, I have tried it on several more locos. No apparent problems so far. I should really come-up with a controller that giveth and also taketh away the stored charge. That would prevent embarrassing "overruns". It's possible to do the same thing with an emergency brake that just shunts a lowish value resistor across the controller output but I think most people would prefer a single speed control knob. There's also the possibility of a low voltage version that would only require one or two s-caps. That might be useful for small locos that don't have a lot
  9. Possibly by Ken Dutton who was at Sheffield Hallam U.
  10. Hi Tom, Still active as far as I know No problem with resistor heating. The dissipation is I squared R which is around 65 milliwatts. Cheers, Andy
  11. Sixty miles is probably too far for it to have any effect. It could just be the UV is degrading anything non-metallic and generating a lot of dust that contaminates the track. Some of it might be slightly acidic too.
  12. Are you near the sea? UV can affect corrosion in a marine environment.
  13. I hope nobody from Network Rail gets any ideas from Dapol about how to control signals
  14. Possibly a bit less expensive It's an off-cut of teak flooring attached to a backplate. The wheel flange is an interference fit with the teak. Negligible runout. Of course it's only good until it's separated from the backplate.
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