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HP Virtual Museum: Model 200A audio oscillator, 1939 …
https://www.hp.com/hpinfo/abouthp/histnfacts/museum/earlyinstruments/0002/0002history.html
A real gem: HP's audio oscillator patent turns 60: In January 2002,HP celebrated the 60 th anniversary of Bill Hewlett's patent for the HP 200A audio oscillator. Posted January 22, 2002. On exactly the same day in history that a Pan American Airlines Clipper completed the first commercial air circumnavigation of the globe, the United States ...
Three New hp Audio Oscillators - Vintage 1956-02
https://www.radioexperimenter.us/1956-02/three-new-hp-audio-oscillators.html
Three New hp Audio Oscillators. Last Updated on Sun, 20 Dec 2020 | Vintage 1956-02. YEAR after year the simple, reliable ~hp-R-C audio oscillator remains one of the work horses of the electronics laboratory. The Hewlett-Packard Company has always taken special pride in the R-C oscillator and has always striven to see that suitable R-C oscillators.
Early Audio Oscillators - HP Memory Project
http://www.hpmemoryproject.org/wa_pages/wall_a_page_01.htm
No escape to the rule, the first portable battery-operated instrument produced by HP was an Audio Oscillator. The HP 204A was introduced on page 13 of the 1950 catalog which is reproduced below for complete specification. The circuitry is, one more time, the Bill Hewlett's classic resistance tuned oscillator with negative feedback made by a 3 ...
Model 200B audio oscillator, 1939 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/008-product.html
Model 200B Audio Oscillator, 1939. An audio oscillator is an instrument that generates one pure tone or frequency at a time. Through the years, HP oscillators were used to design, produce and maintain telephones, stereos, radios and other audio equipment. In 1938, when the sound engineer for the movie Fantasia from the Walt Disney Studios saw ...
Audio & Test Oscillator - HP Memory Project
http://www.hpmemoryproject.org/wb_pages/wall_b_page_10a.htm
The HP 204B, First Full Transistor Audio Oscillator . Introduced in the 1961 catalog, the 204B was the very first fully transistorized and battery-operated HP audio oscillator.
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