crystal radio

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wevans
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Location: La Grande OR
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crystal radio

Post by wevans » Wed Apr 17, 2002 3:09 am

Does anyone have a easy circut for a crystal radio. There are a number of possibilities.

russlk
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Re: crystal radio

Post by russlk » Wed Apr 17, 2002 10:11 am

If you do a Google search on "crystal radio" you will find a lot ot info. Here are two good sites:
http://www.midnightscience.com/
http://w3.one.net/%7Echarlie/contest/

thomasng558
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Re: crystal radio

Post by thomasng558 » Wed Apr 17, 2002 2:19 pm

It's so simple, I doubt that you'll even
need a schmematic. Try old children's books on
electronics.

bodgy
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Re: crystal radio

Post by bodgy » Wed Apr 17, 2002 11:07 pm

Take 1 Germanium Diode OA90 (hmm typed that number without research) 1 coil (or ferrite rod) attach a variable capacitor across the coil and one pair of very high impedance headphones.<p>You haven't stated the frequency/band you want to receive. You will probably need a long wire aeriel, though I did once find a screwdriver was sufficient.<p>The coil one end goes to a good ground the other goes to the moving plates of the cap - the fixed plates go to ground also. The diode connect at the junction of the moving plates connection Anode (non red band side) the cathode connects to the headphones of which one side goes to ground.<p>The better the earth the better the result.<p>Call your set The Cats Whisker.<p>Galena bodgy
On a clear disk you can seek forever.

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