Search results

Search Forums New Posts
  1. Arouse1973

    12 volt remote horn push

    Here you go. Does this look like it might work? http://cpc.farnell.com/rf-solutions/firefly-tx4/firefly-tx-4-switch-434mhz/dp/RF00272 Adam
  2. Arouse1973

    12 volt remote horn push

    Let me have a look for you. If I can't find anything then we could easily design a small circuit as a latch that connects to the remote unit. You up for that? Adam
  3. Arouse1973

    12 volt remote horn push

    As your in the UK you can use 433 MHz for this. You can buy units like the key fobs used for car alarms with the receiver module latching a relay which could then control your relay. Does this sound about right? Adam
  4. Arouse1973

    Connecting USB outlets in parallel for more current draw?

    A couple of points from me, but not knowing how these units work I am only surmising. If the outputs are current limited and not constant current you may run into problems. This is because if any of the individual outputs differ in voltage for some reason then you might find one output feeding...
  5. Arouse1973

    12 volt remote horn push

    Hello When you say remotely what do you mean. Connected with a wire or using a wireless transmitter? If it is the first option then just a latching switch will do the job. Do you know how much current the horn draws? Adam
  6. Arouse1973

    DC Bus in a Loop Configuration. Problem?

    No probs, you will have to let us know how it goes. Cheers Adam
  7. Arouse1973

    Help identify a component

    LOL brain fart alert. I thought you were on about another device that looked like your Triac which had been removed and not the resistor. Adam
  8. Arouse1973

    Help identify a component

    Can you post a picture of the broken part? Adam
  9. Arouse1973

    DC Bus in a Loop Configuration. Problem?

    You got it. The load I used was an example or how to reduce the overshoot. It is likely there will always be a load from the trains. But you could add a load if you needed to, 10R might be too low but I just used this to show the idea. Yes you cant control the risetime but as I said I doubt it...
  10. Arouse1973

    Transformer/Coil

    This looks like a Royer type oscillator so your going to need a core that saturates and one that has a narrow hysteresis. Adam
  11. Arouse1973

    LVDT circuit - need to explain how it works

    Have a look at state variable oscillators. Adam
  12. Arouse1973

    DC Bus in a Loop Configuration. Problem?

    Right here is the formula I used to roughly calculate your system. The first circuit I used shows ringing without a load. This is with a 10us rise-time which is quite fast, I think you will have more delay in your circuit than this. This doesn't include any capacitance the rest of the system...
  13. Arouse1973

    DC Bus in a Loop Configuration. Problem?

    Having the power cables as a loop may cause it to pickup more noise from the trains as they operate. But this is a unlikely to be too much of an issue. Yes you could get over shoot depending on how well damped the system is, as for ringing this is when part of the system oscillates at its tuned...
  14. Arouse1973

    DC Bus in a Loop Configuration. Problem?

    Worked out this I think it's right, you will have to decide if it will be a problem. This is might be worst case and an example. 140 ft of 12 AWG will have 0.2 Ohms resistance. Ten trains requiring 500 mA will need 5 Amp which will drop 1 Volt of the power supply to this position. This will...
  15. Arouse1973

    Phase voltage circuit help

    LOL Kris. I agree yeah I sort of lost the plot when he said the phases and then only had two wires. I have asked him why he is doing this but he hasn't explained yet. I think he needs to explain fully what he wants to do in enough detail and then we can make some design calls. Adam
  16. Arouse1973

    Amplifier circuit determine and design

    Surely you must have been given an example first. What sort of course expects you to do this without an example of some kind. What have you actually covered regarding both amplifiers. Adam
  17. Arouse1973

    DC Bus in a Loop Configuration. Problem?

    Hello LKO The only thing that might be an issue is the resistance of the wire causing a voltage drop that effects the train the furthest away from the power supply. The fix for this would be to increase the size of the wire. The black blocks are connectors right? Can you just explain a bit about...
  18. Arouse1973

    Phase voltage circuit help

    Ok cool and if it works don't forget to thank Kris also, as it was his original idea. But if it doesn't I had nothing to do with it :).........only joking! Thanks Adam
  19. Arouse1973

    Phase voltage circuit help

    If you want to measure each individual phase then the same circuit applies but a transformer for each phase and a common neutral point. This then could get rectified and smoothed to give you a D.C voltage you can measure. You would be basically making 3 mini unregulated power supplies. Adam
  20. Arouse1973

    Phase voltage circuit help

    The transformer will give you an output that is the difference between the two phase voltages. You could convert this to D.C if you wanted. If this is what you mean then Kris's idea is very simple. If it's not what you want can you tell us why you are measuring the voltages? Adam
Top