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Early Audio Oscillators - HP Memory Project
http://www.hpmemoryproject.org/wa_pages/wall_a_page_01.htm
Courtesy of Hewlett Packard Company Before the First At the origin of the story is this audio oscillator built by Bill Hewlett for his Stanford University thesis project in 1938. It is a resistance tuned oscillator covering from 35 cps (frequency unit …
hewlett-pa: The HP 200 Audio Oscillators Series
https://www.radiomuseum.org/forum/hewlett_pa_the_hp_200_audio_oscillators_series.html
Here is the main tuning dial of -hp- Models 200B and 200C Audio Oscillators. Range is 20 cps to 20 kc on 200B, with dial calibrated over approximately 180° and effective scale length of about 20"; 200C has range of 20 cps to 200 kc and …
Audio Oscillator 200A Equipment Hewlett-Packard, HP;
https://www.radiomuseum.org/r/hp_audio_oscillator_200a.html
The 200A audio oscillator of 1939 is the first product of Hewlett Packard (HP). A US patent Nr. 2268872 was granted to W.R. Hewlett in January 6th 1942, filed in July 11th 1939. An audio oscillator is an instrument that generates one pure …
Hewlett-Packard HP-200C audio oscillator - Ohio University
https://people.ohio.edu/postr/bapix/HP200C.htm
This HP-200C is very close in design to the company's initial product. It is a Wien bridge resistance-tuned oscillator with the famous light-bulb stabilized negative feedback circuit designed by Wiliam Hewlett while doing graduate work at Stanford. (Patent #2268872.
HP 200c Manual - The Hewlett Packard Archive
http://hparchive.com/Manuals/HP-200C-Manual-sn-50000.pdf
This audio oscillator provides a source of voltage for amplifier testing, audio response of transmitters, loud speaker resonance tests, a voltage source for bridge measurements and equipment operatingInthe supersonic range.
Hewlett Packard 200A Oscillator - aka “The bomb”
http://www.isorhythm.com/Isorhythm/HP_200A.html
The HP 200A was the first product made by Hewlett-Packard and was manufactured in Dave Packard's garage in Palo Alto, CA. It was a low-distortion audio oscillator used for testing sound equipment. It used the Wien Bridge Oscillator circuit, that …
HP 200A Manual - HP Archive
http://www.hparchive.com/Manuals/HP-200A-Manual-1951.pdf
This element controls the amount of feedback in accordance with the amplitude of oscillation and consequently maintains the amplitude of oscillation substantially constant over a wide fre- quency range. the linear portion of the tube characteristic. cient thermal inertia so that it operates well even at low frequencies.
Audio & Test Oscillator - HP Memory Project
http://www.hpmemoryproject.org/wb_pages/wall_b_page_10a.htm
Audio Oscillator Introduced in the 1961 catalog, the 204B was the very first fully transistorized and battery-operated HP audio oscillator. In the beginning of the sixties, the main and most visible advantage of transistors over vacuum tubes was frequently brought to the foreground in publicity for a new instrument.
Hewlett-Packard HP-200CD audio generator - Ohio University
https://people.ohio.edu/postr/bapix/HP200CD.htm
The Hewlett-Packard HP-200CD audio generator will generate sine waves from 5 Hz to a bit over 600 KHz. That puts its upper ranges right into the broadcast band. It uses a balanced version of the famous light-bulb-stabilized wien bridge oscillator developed by -- you guessed it -- William Hewlett who commercialized it with David Packard.
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