Article View: sci.electronics
Article #21320early wireless receivers
From: Avatar
Date: Thu, 04 May 1989 21:14
Date: Thu, 04 May 1989 21:14
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1447 bytes
In article <11170005@hpfcdj.HP.COM> myers@hpfcdj.HP.COM (Bob Myers) writes:
+As mentioned above, many minerals can be used - I seem to recall reading of
+a WW I (or II?) "survival tactic" which involved building yourself a crystal
+radio out of a lump of coal balanced on the edges of two razor blade nailed
+into a block of wood!
+
Another method for creating a diode semiconductor useful to this purpose is
to mount a razor blade flat against the breadboard (literally!) and use a
safety-pin as a carrier for a piece of graphite, ordinary pencil "lead"!
Again, not much current carry but enough to activate those fabulous megaohm
Philmore headphones! ..those were the days!
--
-Avatar-> (aka: Erik K. Sorgatz) KB6LUY +-------------------------+
Citicorp(+)TTI *----------> panic trap; type = N+1 *
3100 Ocean Park Blvd. (213) 450-9111, ext. 2973 +-------------------------+
Santa Monica, CA 90405 {csun,philabs,randvax,trwrb}!ttidca!ttidcb!sorgatz **
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!amdahl!pyramid!prls!philabs!ttidca!sorgatz From: sorgatz@ttidca.TTI.COM ( Avatar) Newsgroups: sci.electronics Subject: early wireless receivers Message-ID: <4367@ttidca.TTI.COM> Date: 4 May 89 21:14:35 GMT References: <736@ultb.UUCP> <11170005@hpfcdj.HP.COM> Reply-To: sorgatz@ttidcb.tti.com (Erik Sorgatz - Avatar) Organization: Citicorp/TTI, Santa Monica Lines: 16