Asimov wrote:
"Tim Wescott" bravely wrote to "All" (05 Apr 05 09:26:07)
--- on the heady topic of " Crystal radio"

TW From: Tim Wescott
TW Xref: aeinews rec.radio.amateur.homebrew:9149

TW KA6PNL wrote:

Hi I have a friend that son wants to build a crystal radio. I seam to
remember that we grew our own crystal back in the early 60 any help?? Also
where can I find a 1n34 quick have 2 weeks for his science fair.


TW A silicon diode will work, it won't be as sensitive but you can get
TW one at the local Radio Shack (they carry germanium diodes off and on,
TW so they may have some).

TW If you're using germanium diodes get some spares -- I've found them
TW very susceptible to lightning strikes, at least in the circuit that my
TW son and I built.


Why bother? Get a solar cell and power a radio with it. There is
more than 900watts/metre^2 free energy right outside the window.
(mumbling something about "idiots"...)

'cause crystal radios are more fun, and when your 10-year-old puts one
together he or she can understand each and every part in it (those
charge regulator IC's are kinda hard to grok when you're not firm on how
a diode works).

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com