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  1. Arouse1973

    Thevenins and nortons circuit help

    Laplace Your a tech nutter. Thats a compliment by the way:) I thought there was something strange about that circuit. Thanks Adam
  2. Arouse1973

    Please Help! I need some expert advice to specify a component

    Ok just thought I would ask. Lets wait for Hop (hevans) and see what he can muster up. Adam
  3. Arouse1973

    Thevenins and nortons circuit help

    Ok for the Norton I think it is this. Laplace will correct me here if I am wrong. Adam Fig 1. Original circuit with load resistor Fig 2. Short out load and calculate short circuit current. Note this is not the same as the total current from the source. It's what is going through the...
  4. Arouse1973

    Deal of a lifetime!

    Wi Sounds like a winner, nice one. Sometimes by luck you manage to find a gem like that. Adam
  5. Arouse1973

    The existence of 2-3Mv diodes

    Hello Why on earth would you want to do that. Even if they did make them which I doubt they do commercially anyway, they would need to over 32 inches long. What are you trying to do or work out? Adam
  6. Arouse1973

    Please Help! I need some expert advice to specify a component

    So does the control panel already have a means of sensing the resistance? You say you have a resistance reading for the arm. If the ram is always pushing when the gate is closed and monitoring the control panel is monitoring the resistance then I assume pushing back on the ram will increase or...
  7. Arouse1973

    Thevenins and nortons circuit help

    Oh Ok we can work through this together. Adam
  8. Arouse1973

    Hello

    Hello Ross, have fun. Adam
  9. Arouse1973

    Thevenins and nortons circuit help

    Nice one Laplace!
  10. Arouse1973

    Thevenins and nortons circuit help

    So for the Norton equivalent you need to short out the load resistor. Calculate the short circuit current. Remove the short and the load and short out the 12 Volts. Calculate the total resistance. Now Norton circuits don't have a voltage they have something else, see if you can find out what...
  11. Arouse1973

    Thevenins and nortons circuit help

    It's a bit small I can't make it out. First have ago at the Thevenins question first. I'll work on the Norton's for you. But as this is homework I can't give you the answer. Adam
  12. Arouse1973

    Please Help! I need some expert advice to specify a component

    Hi Sean and welcome. I don't know if your after a simple solution or if this will work. What about a simple micro switch which is triggered when the ram moves back beyond a certain distance. We call it a limit switch and if you could attach a plate of some kind to the ram you could put say a...
  13. Arouse1973

    Thevenins and nortons circuit help

    Just realised,:rolleyes: ... the output has to be open circuit to do it the original way, but even with the load removed it still has the 143K attached. So if you remove this then it works. But technically you shouldn't so I think the second way would be the best. Some of the other guys might...
  14. Arouse1973

    Thevenins and nortons circuit help

    Ok I found another way to work it out for Thevenins, that I find easier. Remove the load and add a short. Work out the total resistance. Then work out the current in the circuit. Then use you Thevenins open circuit voltage to find the Thevenins resistance using this total current. Adam
  15. Arouse1973

    Thevenins and nortons circuit help

    I'll have a look later for you. I got a few things to do first. I also need to look at the way we calculate the equivalent resister. I got the answer to this but it's the series and parallel part I need to make sure I told you right. Adam
  16. Arouse1973

    Thevenins and nortons circuit help

    http://www.electricaltechnology.org/2014/01/thevenins-theorem.html
  17. Arouse1973

    Thevenins and nortons circuit help

    Here is one that works. R13 and R14 are the load.
  18. Arouse1973

    Thevenins and nortons circuit help

    Yes you have it! Adam
  19. Arouse1973

    Thevenins and nortons circuit help

    Remember you also have to work out the open circuit voltage don't you. Adam
  20. Arouse1973

    Thevenins and nortons circuit help

    I changed the picture to match your references. So R2 is in parallel with two others that are in series, which are? Adam
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