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crystal radio

Posted: Wed Apr 17, 2002 3:09 am
by wevans
Does anyone have a easy circut for a crystal radio. There are a number of possibilities.

Re: crystal radio

Posted: Wed Apr 17, 2002 10:11 am
by russlk
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/

Re: crystal radio

Posted: Wed Apr 17, 2002 2:19 pm
by thomasng558
It's so simple, I doubt that you'll even
need a schmematic. Try old children's books on
electronics.

Re: crystal radio

Posted: Wed Apr 17, 2002 11:07 pm
by bodgy
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