Crystal Radios (was Re: List spammer ID'd)

From: Pete Turnbull <>
Date: Thu Mar 29 02:37:32 2001

On Mar 28, 22:50, Paul Braun wrote:
> But if you REALLY want to do it right, you wind your own coil on a
> shellacked oatmeal box.....or, a shellacked salt box.
> All of mine used a germanium diode and a prewound coil, so there.
> I'll shut up now.


Everyone (at least, everyone in the UK) knows you wind a hundred turns[1]
or so of 24swg DCC (double cotton covered) copper wire (actually, I used
enamelled copper) on a toilet roll centre, to make a coil about 2" long.

I recall one maths teacher using a toilet roll centre for some
demonstration in a maths class (nothing to do with radio or electronics).
 In his distinctive accent, which was all the more noticable to Scottish
schoolchildren, he announced that this was a "wiyah fohmah". Despite
heckling, he subsequently refused to acknowledge that it might have had any
connection with more mundane functions.

[1] to be honest, I can't remember the standard number of turns. It might
have been less than a hundred, and I'm too lazy to work it out right now.
 And it doesn't have to be 24swg, you just use whatever you can scrounge.

Pete						Peter Turnbull
						Network Manager
						Dept. of Computer Science
						University of York
Received on Thu Mar 29 2001 - 02:37:32 BST

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