The complete circuit project above can be found at: Techlib.com
Very detailed, with pictures, photographs, circuit enhancements, etc.
Once you get started reading the 'Techlib' website, there's no stopping! Have fun!

Below are a couple other related links to check:

• The Journey to Forever--Crystal Radio
  
• Building a simple crystal radio
  
• Crystal Radios and Tubes
  
• Dave's Homemade Crystal Radios
  
• Radio Crystal Blue
  
• Wikipedia Explanation
  
• Phill's Oatmeal Radio (pdf file)
  
• The Xtal Set Society
  
• Scott's Crystal Radios
  
• Radio-kits Discussion Group
  
• Bizarre: Crystal radio
  
• Foxhole radio - true tinkering!
  
• Xtal Radio Plans
  

Copyright:
The circuit as published above is used only as a logo to indicate "Crystal Radio" (hence no component values), and is copyright © Charles Wenzel and Techlib.com. Used with permission.

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Copyright © Tony van Roon