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About RF Cafe
Copyright: 1996 - 2024 Web BSEE - KB3UON RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived... All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowl My Hobby Website: |
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Bell Telephone Laboratories - Transistor's 10th Anniversary
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Bell Telephone Laboratories Ad
Point-contact transistor (wikipedia)
The remarkable transistor observes its 10th birthday In 1948, Bell Telephone Laboratories announced the invention of the transistor. In 1958, the transistor provided the radio voice for the first United States satellite. To advance the transistor to its high level of usefulness, Bell Labs had solved problems which, in themselves, approached the invention of the transistor itself in scientific achievement. First, there had to be germanium of flawless structure and unprecedented purity. This was obtained by growing large single crystals - and creating the "zone refining" technique to purify them to one harmful part in ten billion. The "junction" transistor, another radical advance, spurred transistor use. Easier to design, lower in noise, higher in gain and efficiency, it became the heart of the new electronics. An ingenious technique for diffusing a microscopically thin layer on semiconductors was created. The resulting "diffused base" transistor, a versatile broadband amplifier, made possible the wide use of transistorized circuits in telephony, FM, TV, computers and missiles. In telephony the transistor began its career in the Direct Distance Dialing system which sends called telephone numbers from one exchange to another. For Bell System communications, the transistor has made possible advances which would have been impossible or impractical a brief decade ago. 1958-Satellite transistor, incorporating 10 years of Bell Labs research and development. Bell Telephone Laboratories World Center of Communications Research and Development
Posted April 17, 2020 |
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