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HP 200A - Wikipedia
https://en.wikipedia.org/wiki/HP_200A#:~:text=The%20HP%20200A%20was%20the%20first%20product%20made,the%20subject%20of%20Bill%20Hewlett%20%27s%20Masters%20thesis.
Model 200A Audio Oscillator, 1939 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/002-product.html
Model 200A 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. The Model 200A began as the subject of Bill Hewlett's master's thesis at Stanford University in the late 1930s.
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 60th 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 Patent Office conferred the …
Hewlett-Packard HP-200A audio oscillator - Ohio University
https://people.ohio.edu/postr/bapix/HP200A.htm
(Link is to the HP history site detailing the 200A) . Like the other HP oscillators, the HP200A is a Wien bridge resistance-tuned audio oscillator using the light-bulb stabilized negative feedback circuit designed by William Hewlett while doing graduate work at Stanford. (Patent #2268872. Application filed in 1939 and granted in 1942).
Audio Oscillator 200A Equipment Hewlett-Packard, HP;
https://www.radiomuseum.org/r/hp_audio_oscillator_200a.html
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. The Model 200A began as the subject of Bill Hewlett's master's thesis at Stanford University in the late 1930s.
The 200-A Hewlett-Packard's First Product - SMECC
http://www.smecc.org/the_200-a_hewlett-packard's_first_product.htm
The wide frequency range, combined with excellent frequency and amplitude stability, made the H-P 200 oscillator family the standard audio frequency generator for a generation of engineers and scientists. I well recall spending many hours with these oscillators in grad school, in electronic research labs at Hughes Aircraft Company, and at TRW.
hewlett-pa: The HP 200 Audio Oscillators Series
https://www.radiomuseum.org/forum/hewlett_pa_the_hp_200_audio_oscillators_series.html
The HP 200 Audio Oscillators Series "From HP Catalog 18A" Laboratory Instruments", Copyrighted 1945." ADVANTAGES: No zero setting • Great stability Constant output Wide frequency range Logarithmic scale Low distortion • Light weight USE THEM FOR: Amplifier testing Broadcast transmitter audio response Source of voltage for bridge measurements
Early Audio Oscillators - HP Memory Project
http://www.hpmemoryproject.org/wa_pages/wall_a_page_01.htm
Starting from the innovative concept of the 200A oscillator, many instruments have been built to fill in many gaps in the electronic industry of the 40s and 50s. New options added to the original circuit basis, have generated a complete signal sources product line to solve different measurements needs.
Hewlett-Packard HP-200AB audio generator - Ohio University
https://people.ohio.edu/postr/bapix/HP200AB.htm
The Hewlett-Packard HP-200AB audio generator will generate sine waves from 20 Hz to 40 KHz. Like the other HP audio generators, the circuit uses the famous light-bulb-stabilized Wien bridge oscillator patented by William Hewlett in the late 1930's. This HP-200AB is an early one with serial #632. Price in the1953 catalog was $120. Repairs
Model 200B audio oscillator, 1939 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/008-product.html
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 the Model 200A audio oscillator in action, he asked Bill Hewlett to …
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