CK722
Transistoren CK722 var den første "lavpris" junction transistor tilgængelig for offentligheden. CK722 var en PNP germanium beregnet til små signaler. CK722 blev udviklet af Norman Krim – og den blev introduceret af Raytheon i starten af 1953 for $7,60 stykket; prisen blev reduceret til $3,50 i slutningen af 1954 og til $0,99 i 1956. CK722 var "CK721"-chips, som ikke opfyldte CK721-kravene. CK721 var Raytheons transistor designet til høreapparater. [1] Raytheon opfordrede aktivt hobbyfolk med design konkurrencer og reklamer. [2] [3]
I 1950'erne og 1960'erne, blev der udgivet hundredvis af hobbyfolks elektronikprojekter som anvendte CK722 transistorer og som blev udgivet i populære bøger og tidsskrifter. [4] [5]
Se også
- Alfred Powell Morgan – en forfatter af ungdomsorienterede bøger om tidlig elektronik
- OC71 og AC125-familien
Kilder/referencer
- ^ Garner, Lou (oktober 1979). "Solid State: Down Nostalgia Lane". Popular Electronics. New York: Ziff-Davis. 16 (4): pp. 86, 87, 92.
{{cite journal}}:|pages=har ekstra tekst (hjælp) - ^ "$10,000 in Prizes. Enter Raytheon's Transistor Application Contest!". Popular Mechanics. Chicago: Popular Mechanics Co. 99 (6): p. 219. juni 1953. ISSN 0032-4558.
{{cite journal}}:|page=har ekstra tekst (hjælp) Raytheon sponsored a design contest for applications that used the CK722 transistor. The top prize was $5,000. - ^ "8 Transistor circuits you build with Raytheon CK722 transistors". Popular Electronics. New York: Ziff-Davis. 2 (4): p. 8. april 1955.
{{cite journal}}:|page=har ekstra tekst (hjælp) CK722 Advertisement - ^ "How to Build Experimental Transistor Receivers". Popular Mechanics. Chicago: Popular Mechanics Co. 100 (4): pp. 246–248. oktober 1953.
{{cite journal}}:|pages=har ekstra tekst (hjælp) - ^ Garner, Lou (november 1957). "Transistorized Instrument Amplifier". Popular Mechanics. Chicago: Popular Mechanics Co. 108 (5): pp. 160–162.
{{cite journal}}:|pages=har ekstra tekst (hjælp)
Eksterne henvisninger
- The CK722 transistor website and museum
- Goldstein, Harry (marts 2003). "The Irresistible Transistor". Spectrum. IEEE. 40 (3): pp. 42–47. doi:10.1109/MSPEC.2003.1184435.
{{cite journal}}:|pages=har ekstra tekst (hjælp) webarchive backup: Free version Citat: "...The delight on Norm's face erased 80 years, and for a few minutes he was that same precocious boy who'd built his own crude TV..." - Point-Contact and Junction Transistors
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