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.