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HP 200A front panel Insides of the Hewlett-Packard HP 200A. The light bulb repurposed as a positive temperature coefficient resistor is to the right of the upper section of the variable capacitor, which is the large structure in the center.
Hewlett-Packard's first product, built in the garage, was an audio oscillator, the HP200A. [8] One of Hewlett-Packard's first customers was Walt Disney Studios, [9] which purchased eight oscillators to test and certify the sound systems in theaters that were going to run the first major film released in stereophonic sound, Fantasia. [10]
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Hewlett, along with David Packard, co-founded Hewlett-Packard, and Hewlett-Packard's first product was the HP200A, a precision Wien bridge oscillator. The first sale was in January 1939. [18] Hewlett's June 1939 engineer's degree thesis used a lamp to control the amplitude of a Wien bridge oscillator. [19]
The wien-bridge page also implies that thermistors can be used in the amplitude control so at least this use could be mentioned even if the HP200A use cannot be justified on the basis of the lack of equivalence between bulb and thermistor. Thank you for taking the time to give a considered response to my enquiry.
Audio-frequency signal generators generate signals in the audio-frequency range and above. An early example was the HP200A audio oscillator, the first product sold by the Hewlett-Packard Company in 1939. Applications include checking frequency response of audio equipment, and many uses in the electronic laboratory.
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