Recent content by Martaine2005

  1. Martaine2005

    Electronic device/solution idea

    A Faraday cage for women and children?. Of course, have to be on wheels!.
  2. Martaine2005

    Electronic device/solution idea

    All About Circuits. SA = Se&ual Assau£&
  3. Martaine2005

    Electronic device/solution idea

    It already exists. An electric chair!!
  4. Martaine2005

    Book light improvement

    Double up on the battery. If it lasted ‘10 times’, it should last 20 times.
  5. Martaine2005

    RF booster or repeater

    Example on the theory. Your query seems to have changed somewhat. Now you’re asking about transmitting RF. And not causing interference. This is not advisable. Use the appropriate repeater/booster that’s readily available and doesn’t require a license.
  6. Martaine2005

    RF booster or repeater

    A quick google search suggests that car radios and mobile phone signals are indeed repeated via specialised ‘leaky feed coax’ running the length of the tunnel walls. While mobile, cellular signals use a base station in the tunnels technical room. Again, using specialised ‘leaky feed’ cable or...
  7. Martaine2005

    LED TESTER c4 value

    C4 is a 25V 470uF capacitor. Hope that helps.
  8. Martaine2005

    Is this true? Diamond battery. Cool

    I doubt that this is anywhere possible. A diamond is indeed a great land made stone, but a radioactive capacitor or voltage storage it certainly isn’t. Not everything on the WWW is true.
  9. Martaine2005

    Cat door sensor jammed by steel (metal) enforced wall

    The second to last photo and the last photo show the overall aperture. 1/2” plastic strips inside the aperture forming a barrier. This means opening the aperture/hole a further 1/2” all round.
  10. Martaine2005

    Cat door sensor jammed by steel (metal) enforced wall

    Yes, metal can effect radio waves of RFID. It can disrupt and de-tune the radio signal. Plastic will form a barrier.
  11. Martaine2005

    Cat door sensor jammed by steel (metal) enforced wall

    RFID!. Interesting. You said it works about 50mm (5cm) away from the door. I would first try a plastic barrier. A half inch (1/2”) plastic around the opening to form a barrier. This obviously means opening the hole by a further 1/2”.
  12. Martaine2005

    Cat door sensor jammed by steel (metal) enforced wall

    The electronics are in the front, not the tunnel section you put foil over. Also, adding foil is doing the same thing as the metal section. I wonder what type of cat flap it is?. When installed into the door, does the flap stay unlocked or locked?. I ask because some have a magnet in the cats...
  13. Martaine2005

    Ignition coil...

    I think it would depend on the frequency as ignition coils are pulsed DC. Our homes are 50/60Hz depending on what country you’re in. This may be far too slow and constant and over heat the coil. But I’ve never tried it so it’s only a guess.
  14. Martaine2005

    Loop parasitic

    LMGTFY……..nah!
  15. Martaine2005

    Power factor

    The answers to your questions are too easy to find on the WWW. https://www.fluke.com/en-gb/learn/blog/power-quality/power-factor-formula
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