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Kevin Kelly has a great round up of crystal radio builds, free plans and kits (some I haven't seen either) - Link.
Inspired related round up:
HOW TO - Building a crystal radio out of household items - Link.
Refugee Radio - An energy-independent AM-receiver radio... - Link.
Building a radio in 10 minutes - Link.
Crystal radio mousetrap - Link.
Crystal Radio Kit for the Modern Era - Link.
Make a "Cigar Box" crystal radio set - Link.
HOW TO - Make a simple AM radio - Link.
From the pages of MAKE:
DIY Aircraft Band Receiver. Modify an AM/FM radio to pick up air traffic control communications. MAKE 09 - Page 27. Subscribers--read this article now in your digital edition.
TV Set Salvage. Nothing good on TV? Well, there's plenty of good stuff in a TV. MAKE 09 - Page 138. Subscribers--read this article now in your digital edition.
The mouse-trap one is particularly great. Good show!
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Very nice. Mine is very ugly, but it works -- it pulls in Radio Kismat in London.
Check it out, complete with an audio clip (scroll down to December 16): http://www.gadgeteer.us/GADGETEERNEWS.html
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