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  1. Arouse1973

    Grounded co-planar waveguide design

    I have found some interesting information about Transmission lines. http://www.feynmanlectures.caltech.edu/II_24.html http://www.standard-wire.com/coax_cable_theory_and_application.html And some more information about coax cables which you might find interesting. I know you are using a PCB WG...
  2. Arouse1973

    Grounded co-planar waveguide design

    The reason why the teachers say that is because they don't know. They don't want you asking questions they can't answer :)
  3. Arouse1973

    Grounded co-planar waveguide design

    It's not black magic what ever anyone tells you. That's just them telling you that they think they are better than you. That's bollocks. It may involve quite a bit of Physics and math which I don't have to hand. What I will do is try to get some stuff together to show you. Thanks Adam
  4. Arouse1973

    Grounded co-planar waveguide design

    Nope you are not missing something. You will get some losses due to frequency but for your application it should be fine. For long traces you will get resistive losses and dielectric losses but they will be small for you. Thanks Adam
  5. Arouse1973

    hello from uk

    Welcome to EP Reed. Adam
  6. Arouse1973

    EMC/EMI Testing

    It does depend on the product and as KE says the country in which you are going to place the product on the market makes a difference. It's a very complicated subject, what is your product? Adam
  7. Arouse1973

    Pcb as antenna track

    As Dave mentioned above. You will be limited by the size of the PCB ground plane you are using. Getting the first part of the dipole is easy. You need 1/4 wavelength of 1 mm (approx.) solid core wire. The second part of the dipole or image antenna or counterpoise, what ever you want to call it...
  8. Arouse1973

    Beginning electronics, understanding whats actually happening

    What on earth is he talking about?
  9. Arouse1973

    Pcb as antenna track

    What radio module are you using, most of the application notes will have details about connecting an antenna and any filtering / matching components that are needed. Adam
  10. Arouse1973

    Rewiring Garage Door Opener

    If you just want to make or break a circuit use SPST.
  11. Arouse1973

    Rewiring Garage Door Opener

    What about using a small relay?
  12. Arouse1973

    Rewiring Garage Door Opener

    What is the sensor and how does it open in use?
  13. Arouse1973

    Rewiring Garage Door Opener

    If you are running the RX board on its own you will need a DC power supply won't you? :) Being an RX PCB I wouldn't have thought it required much current. The popular PSUs that are around this voltage are 24 Volts. A 500 mA one I am sure will be more than adequate. You will be able to find a...
  14. Arouse1973

    Forum Category Feedback

    Looking good Ian. I used to use the Forum sections to look for posts I am interested in. Now I just use the new posts or recent posts option and very rarely use the main Forum page. So for me I notice little difference. However I do like how you have split the Forums into defined sections. I bet...
  15. Arouse1973

    Rewiring Garage Door Opener

    What you could try is connecting a resistor an LED and diode in series. Then connect this across the power pins of the RX (Violet and Green) PCB. Then reverse the connection and try again. If the LED only light in one direction then the supply is DC. Try a 2200 Ohm resistor or thereabouts and a...
  16. Arouse1973

    Rewiring Garage Door Opener

    I still think the board will run from DC. We need to try and measure it if possible. Do you have any components? Resistors, LEDs?
  17. Arouse1973

    Rewiring Garage Door Opener

    Ok so I am signing off in a moment and if you could do this for me just in-case any of the other guys come on to help you later. 1) Have a look and see if you can trace where the purple wire gets its power from the other PCB. 2) When possible measure the voltage across the green and purple...
  18. Arouse1973

    Rewiring Garage Door Opener

    Ok you have the older version of PCB then?
  19. Arouse1973

    Rewiring Garage Door Opener

    Do you have a digital multi-meter?
  20. Arouse1973

    Rewiring Garage Door Opener

    Ok not convinced the RX board has it's own rectifier because if you look at the other PCB there are 4 diode and a large capacitor next to each other in an arrangement which could indicate a bridge rectifier. That then means the RX PCB being fed by this and possible regulated down by IC1. Can you...
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