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AM Radio Kits

Discussion in 'Home Brew' started by NorthStar, Dec 20, 2009.

  1. NorthStar

    NorthStar Administrator

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    Anyone into building these?
    Thinking of buying some to build


     

  2. Robb

    Robb Yup

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    Links?
     
  3. NorthStar

    NorthStar Administrator

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  4. Robb

    Robb Yup

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    I remember back in the day when I was a cub scout. I built my own radio out of a toilet paper tube and some junk wire - in a cigar box. The tough part was getting/finding a piece of Gallium. Capacitor was made from tin foil and wax paper. All of the instructions for this project came right out of my scout handbook. I then used a safety pin as the cat whisker. Boy, was I surprised when I made it work!
     
  5. -Devil-

    -Devil- KD5ZJU

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    hah those days were fun for sure
     
  6. NorthStar

    NorthStar Administrator

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    Lots of great things to build!
     
  7. kg5un

    kg5un Member

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    My first kit was the old Science Fair shortwave from Radio Shack back in the late 70's it was great.
    My last was the Tentec 1254 and I have to say it was awesome, I would love to build another for the experience as well as having a decent extra receiver in the shack.
     
  8. Beetle

    Beetle Sr. Member

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    Gallium? Germanium I can see, but gallium??

    I guess gallium would be usable for the "crystal" (the safety pin catwhisker was touching the gallium, right?). I used to use a piece of iron pyrites (fools gold) for my crystal - I had a piece about the size of a large marble, and it was very responsive.

    These days, grab a 1N34 from RadShack and go with it.

    Where did you find the gallium?
     
  9. Robb

    Robb Yup

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    I got it from my older sisters rock collection.
    She didn't mind.
    It worked!
     
  10. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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    I'm with you Pat. Pure gallium will melt when held in your hand. I have heard of using germanium but never gallium.

    Gee Robb, if you mixed that gallium with some arsenic you could have made a gallium-arsenide FET (Ga-As FET) preamp for your crystal set. :D
     
  11. Robb

    Robb Yup

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    Hey, making/building my first radio at age 9 makes me the original radio operator!
    Next step: An Elecraft K-3!
    :D
     
  12. Beetle

    Beetle Sr. Member

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    Might need one of those nifty cauldrons to mix the stuff up. Try diagonalley dot com ;)

    Tried to enter an actual web address, but the post comes up "Website Under Construction". Who knew?
     
  13. 505

    505 Member

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    Modern Crystal AM radio schematic.

    Hello Group,

    I notice that you all have this thread under control.
    Here is my 2 cents worth. I scanned this circuit from
    my Science Fair 200 in one Electronics lab.

    These are very modern common components.

    http://home.inreach.com/mikedh/screenshots/crystalradio01.jpg
     

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