[NYListens]

Originally Posted by Phil Nelson

The Xtal Set Society sells a range of crystal kits:

http://www.midnightscience.com/kits.html

You can also buy a basic kit from Antique Electronic Supply:

http://www.tubesandmore.com/

If this will be a group project, you might consider building a kit yourself beforehand, and trying it out in the location where your group will be working. It might be disappointing if everyone completes their project and you hear a chorus of "Can you hear anything?" "I can't hear anything!"

Phil Nelson

I built the oatbox radio a few years ago. It was pretty easy and didn't take much time other than ordering the parts.