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Series-tuned, Shunt-fed Crystal Radio with Air-core Coil

Discussion in 'Home Brew' started by vu2nan, Dec 4, 2015.

  1. vu2nan

    vu2nan Active Member

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  2. fodendaf

    fodendaf Active Member

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    I've been following all your posts but have not built anything as I understand a good earth is essential in getting such radios to work correctly which I do not have, being on the first floor and surrounded by cement . I wonder do you have any circuits for a superregenerative radio?
     
    Mudfoot likes this.
  3. vu2nan

    vu2nan Active Member

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    Hi Fodendaf,

    Why not use a water pipe earth?

    Or service main earth (3rd pin)?

    A crystal radio is much easier to build and get working than a superregenerative one.

    Many thanks for following.

    Regards,

    Nandu.
     
  4. fodendaf

    fodendaf Active Member

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    I wound the inductor, all I had was 1mm wire and what I calculated from your circuit the coil worked out at about 104 uh. mine measures 110 uh with 17 turns on a 21.5cm former on a chinese tester device. I'll have to give up as I dont have any germanium or schottky diodes to hand, maybe if break up a disposable razor I could make a point contact diode but some other day.
     
  5. vu2nan

    vu2nan Active Member

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