Oscillators – Solid state active element oscillator – Transistors
Patent
1975-07-02
1977-05-03
Kominski, John
Oscillators
Solid state active element oscillator
Transistors
331177R, 331179, 333 70CR, H03B 520
Patent
active
040217566
ABSTRACT:
An electronic remote control transmitter employs a two transistor cascade oscillator having positive and negative feedback loops. The oscillator voltage is supplied through a switch assembly containing a plurality of momentary contact switches to a pair of voltage dividers supplying signal voltages in predetermined ratios to a two branch circuit in the negative feedback loop. One branch contains an inductor and the second branch a capacitor. Closure of any switch completes the DC circuits for the transistors. Signal voltage is supplied to the branches to produce a minimum amplitude, zero phase shift condition which establishes oscillation at that predetermined frequency. The output of the oscillator is amplified by a third transistor and supplied to an ultrasonic transducer for generating acoustical control signals.
REFERENCES:
patent: 2173427 (1939-09-01), Scott
patent: 2439245 (1948-04-01), Dunn
patent: 2444084 (1948-06-01), Artzt
patent: 2782311 (1957-02-01), Colander et al.
patent: 3229228 (1966-01-01), Reynolds
patent: 3303435 (1967-02-01), Bradmiller et al.
patent: 3535430 (1970-10-01), Maynard
patent: 3569863 (1971-03-01), Cowpland
patent: 3686587 (1972-08-01), Dann
Citta Richard W.
Podowski Robert R.
Camasto Nicholas A.
Kominski John
Zenith Radio Corporation
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