The Road to the Transistor, By Jed Margolin Citat: "...The copper oxide rectifier was invented in 1927 by L.O. Grondahl and P.H. Geiger...The selenium rectifier was invented in 1933 by C.E. Fitts..."
radiomuseum.org: OCP71 Citat: "... PNP germanium transistor OC71 without black paint intended as photo-transistor. Red dot indicates collector..."
raspberrypi.org
raspberrypi.org: Xenon Death Flash: a free physics lessonArkiveret 17. marts 2015 hos Wayback Machine Citat: "...Importantly, it’s ONLY really high-intensity bursts like xenon flashes and laser pointers that will cause the issue. Other bright lights – even camera flashes using other technologies – won’t set it off...This component that’s causing the issue is in a WL-CSP package: a bare silicon die which has solder balls attached...Silicon junctions (the types that are responsible for making diodes and transistors and other such electronic miracles function) can be ‘upset’ by this photoelectric effect if it is large enough (i.e. if enough light of the right energy [i.e. colour] is fired at them). This seems to be what is happening to our power supply chip..."
raspberrypi.org: Xenon Death Flash: a free physics lessonArkiveret 17. marts 2015 hos Wayback Machine Citat: "...Importantly, it’s ONLY really high-intensity bursts like xenon flashes and laser pointers that will cause the issue. Other bright lights – even camera flashes using other technologies – won’t set it off...This component that’s causing the issue is in a WL-CSP package: a bare silicon die which has solder balls attached...Silicon junctions (the types that are responsible for making diodes and transistors and other such electronic miracles function) can be ‘upset’ by this photoelectric effect if it is large enough (i.e. if enough light of the right energy [i.e. colour] is fired at them). This seems to be what is happening to our power supply chip..."
wylie.org.uk
wylie.org.uk: Mullard Semiconductors Citat: "...It is well-known that semiconductor junctions can be light-sensitive, and there is a widely repeated story that the OCP71 was just an ordinary OC71 without the black paint ('dope'). Because the OCP71 was more expensive, some people just scraped the paint off an OC71, to create an equivalent to the OCP71. The story then claims that Mullard changed the filler in the capsules from clear to opaque, to prevent this practice...Thanks to correspondence with an ex-Mullard employee from the Mitcham works, I now know that this story is entirely wrong..."
