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US2140840A - Audio frequency oscillator - Google Patents
https://patents.google.com/patent/US2140840A/en
Moreover, the invention contemplates a novel audio frequency oscillator including a plurality of glow discharge lamp oscillators combined in such a manner that the oscillations produced by one of them will react on and will modify or modulate the oscillations produced by the others so that the most varied sounds, including the various pitched and unpitched sounds found in nature, …
Early Audio Oscillators - HP Memory Project
https://www.hpmemoryproject.org/wa_pages/wall_a_page_01.htm
A small modification of 6 resistors values resulted in different frequency ranges 35 to 35,000 cps for the 200A and 20 to 20,000 cps for the 200B. All other specifications are common for the two units. A two-stage power amplifier with transformer-coupled output delivers 1 Watt into a 500 ohm resistance load.
Audio frequency oscillator - Hoffman
https://www.freepatentsonline.com/2140840.html
Thus, it has been proposed to provide a thermionic tube oscillator capable of producing audio frequency oscillations within the full audible range. These os>5 cillations have been converted into sound by means of earphones or other sound producing means applied to the ears of the patient to be treated.
US4439734A - Metal object locator including frequency ...
https://patents.google.com/patent/US4439734A/en
The result is a difference frequency which varies at an audio rate equal to the change in hertz of the sense oscillator frequency produced by the obscured object. …
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