Patent US1017935A successfully refreshed from Google Patents.
Patent US3596205A successfully refreshed from Google Patents.
US3596205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level regulator for an oscillator
Assignee: U S Holding Co Inc
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Filing: 1969-08-15
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Granted: 1971-07-27
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Expires: 1989-08-15
Abstract
Abstract The amplitude level of an oscillator employing a transformer winding as a tank circuit is controlled by varying the gain in the tank circuit. This variation in gain is directly regulated by a transistor circuit connected in parallel with the input winding of the transformer. The level of conduction of the transistor, in turn, is determined by a feedback loop which interconnects the output of the oscillator and the transistor. Variations within the loop determining the level at which a stabilized amplitude is to exist are produced by varying a resistance which, in turn, varies the bias to an operational amplifier within the loop.
Inventors
- 👤 Morris Ribner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:04
CPC Classifications
H; H03; H03L; H03L5/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
An audio frequency oscillator control circuit comprising an oscillator circuit including a first transistor, the oscillator circuit including a transformer coupled between the emitter and the base of the first transistor to provide voltage gain and phase shift and thus enable oscillation, a second transistor coupled across input terminals of the transformer for controlling the amplitude of oscillator signals, and a feedback loop connected between the collector of said first transistor and a control element of the second transistor to provide signals to regulate the oscillator amplitude.
Claim 2
Dependent Claim
87 words
An audio frequency oscillator control circuit comprising an oscillator circuit including a first transistor, the oscillator circuit including a transformer coupled between the emitter and the base of the first transistor to provide voltage gain and phase shift and thus enable oscillation, a second transistor coupled across input terminals of the transformer for controlling the amplitude of oscillator signals, and a feedback loop connected between the collector of said first transistor and a control element of the second transistor to provide signals to regulate the oscillator amplitude.
Claim 3
Dependent Claim
62 words
A circuit, as claimed in claim 1, in which the feedback loop includes an operational amplifier coupled to provide control signals to the second transistor, and means for biasing the operational amplifier so that, in the absence of a signal from the oscillator circuit, the operational amplifier will turn the second transistor ''''off'''' to permit a maximum signal amplitude from the oscillator.
Claim 4
Dependent Claim
55 words
A circuit, as claimed in claim 1, in which the feedback loop includes an operational amplifier coupled to control the second transistor, and means for altering the bias to said operational amplifier to produce a change in the signal to the second amplifier and thereby alter the stabilized amplitude of the signal from the oscillator.
Claim 5
Dependent Claim
76 words
A circuit, as claimed in claim 1, in which said circuit is coupled through buffer means and a summing resistor to a terminal, and a second circuit, identical to the circuit of claim 1 except for differences necessary to generate a different frequency, is coupled through additional buffer means and a summing resistor to the same terminal, whereby signals from the two circuits may be mixed together at the common terminal to provide a multifrequency signal.
Claim 6
Dependent Claim
54 words
A circuit, as claimed in claim 4, in which the buffer means includes at least one transistor amplifier connected as an emitter follower for the final output circuit through the summing resistor to the terminal, and the buffer means includes a connection directlY from its emitter through an RC circuit to the feedback loop.
Claim 7
Dependent Claim
58 words
A circuit, as claimed in claim 1, in which the transformer has a primary winding connected in series with the emitter of the first transistor and in shunt with the emitter-collector circuit of the second transistor, and the transformer has a secondary winding coupled to the base of the first transistor to provide control to the first transistor.
Claim 8
Dependent Claim
22 words
A circuit, as claimed in claim 1, in which the second transistor is coupled to the first through a DC isolation capacitor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |