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Article #3818Crystal radios - wasn't it a 'galena' crystal?
From: Mike Smith
Date: Thu, 23 Nov 1989 01:06
Date: Thu, 23 Nov 1989 01:06
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Wasn't the detector in old crystal radios made of 'galena'? Someone posted that the crystal was a germanium lump, but I seem to remember 'galena' as the stuff... If so, it raises an interesting point. Galena is PbS (Lead Sulfide). Taking a look at the periodic chart it looks like Pb and S are in about the right places to make a semiconductor (like Indium Phospide, Gallium arsenide, etc.) Is PbS a semiconductor (if properly doped)? If so, what are it's properties? I seem to remember some 'old timers' saying that a good crystal was far better than those new fangled diode things... -- E. Michael Smith ems@apple.COM 'If you can dream it, you can do it' Walt Disney This is the obligatory disclaimer of everything. (Including but not limited to: typos, spelling, diction, logic, and nuclear war)
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!apple!ems From: ems@Apple.COM (Mike Smith) Newsgroups: sci.electronics Subject: Crystal radios - wasn't it a 'galena' crystal? Keywords: galena PbS radio crystals Message-ID: <5386@internal.Apple.COM> Date: 23 Nov 89 01:06:54 GMT Organization: Apple Computer Inc., Cupertino, CA Lines: 20