Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Bob Eager Newsgroups: alt.folklore.computers Subject: Re: 1957 LED Date: 11 Dec 2015 22:46:32 GMT Lines: 35 Message-ID: References: <20151211154649.335634cf5f6d52729fd8857f@eircom.net> <20151211183415.fc6f3fea1533aabf7476e9c7@eircom.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net HcH7O+Ll/fjkpUpvjkf/EAqjibzaXeo/EU2LSgy79obkCZ7E9S Cancel-Lock: sha1:ZnJrjqbhcVhcX8FmikFRZtrXW/I= User-Agent: Pan/0.139 (Sexual Chocolate; GIT bf56508 git://git.gnome.org/pan2) Xref: csiph.com alt.folklore.computers:155077 On Fri, 11 Dec 2015 15:39:35 -0600, Charles Richmond wrote: > "Ahem A Rivet's Shot" wrote in message > news:20151211183415.fc6f3fea1533aabf7476e9c7@eircom.net... >> On Fri, 11 Dec 2015 17:37:48 -0000 "gareth" >> wrote: >> >> [snip...] [snip...] >> [snip...] >> >> >>> The point being, of course, that in commercial products, the black >>> paint peeling off resulted in undesirable photo-electric effects, so >>> requiring a change to an opaque filling. >> >> Yeah I heard that claim - it seemed specious, after all in most >> commercial products the transistors were inside a box that didn't let a >> lot of light in. >> >> > I remember having a very early transistor radio that used germanium > transistors. These transistors were in little metal cans that I think > block most all of the light to the transistor junctions. Some of them were in glass enclosures. I used to file a groove round the enclosure, break it off, wash the semi-opaque jelly off, and refit the enclosure to make a cheap phototransistor. -- Using UNIX since v6 (1975)... Use the BIG mirror service in the UK: http://www.mirrorservice.org