[Sugar-devel] Turtle art crystal radio

[James Simmons]

I built a crystal radio as a kid.  As I remember it, you make a
razor-blade diode by laying the razor flat and using the point of a
safety pin as the cat's whisker.  The book I read this in was similar
to this article on "foxhole radios":

http://www.crystalradio.net/crystalplans/xximages/foxholeemergencyradios1.jpg

A telephone receiver would be better for listening to the signal than
trying to use an XO as an amplifier.

James Simmons


On Sat, Dec 4, 2010 at 5:38 PM,  <forster at ozonline.com.au> wrote:
>
>> Interesting...can you elaborate? (crystal radio was a childhood
>> obsession of mine...)
>>
>> Sameer
>
> see http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors#The_XO_as_an_audio_amplifier
>
> I was able to build a crystal radio from XO, wire, cardboard, plastic sheet and foil except for the diode. Wikipedia says that rusty razorblades will produce rectifying junctions but I couldnt make one.
>
> Tony
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