Patent US1002937A successfully refreshed from Google Patents.
Patent US3564295A successfully refreshed from Google Patents.
US3564295A
Expired / Lapsed
US
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Frequency doubling circuit
Assignee: KIMBALL PIANO AND ORGAN CO
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Filing: 1967-07-19
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Granted: 1971-02-16
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Expires: 1987-07-19
Abstract
Abstract The specification discloses a frequency doubling circuit in which the input side of the circuit receives alternating current and one half wave thereof is supplied to the output side of the circuit via a diode while the other half wave biases a transistor to conduction to supply a half wave to the output side of the circuit of the same polarity as the half wave supplied via the diode. A capacitor between the output side of the circuit and a load stage blocks direct current so the supply to the load stage is in the form of alternating current at double the frequency of the current supply to the input side of the circuit.
Inventors
- 👤 Mathew A Slaats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:05
CPC Classifications
H; H03; H03B; H03B19/00; H03B19/06; H03B19/14; G; G06; G06G; G06G7/00; G06G7/12; G06G7/25; H03B19/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
In a frequency doubling circuit: a source of alternating current, a single transistor having a base and an emitter and a collector, a source of direct current connected between ground and the emitter of said transistor, resistance means connected between ground and the collector of said transistor, a biasing resistor connected between the emitter and the base of said transistor, one side of said alternating current source being connected to ground, a condenser having one side connected to the other side of said alternating current source and the other side connected to the base of said transistor, and a diode connecting the said other side of said alternating current source to a first point along said resistance means near said collector, a capacitor having one side connected to said first point, the other side of said capacitor and a second point along said resistance means near the ground forming output terminals for said circuit across which there is developed a frequency double that of the said alternating current source.
Claim 2
Dependent Claim
169 words
In a frequency doubling circuit: a source of alternating current, a single transistor having a base and an emitter and a collector, a source of direct current connected between ground and the emitter of said transistor, resistance means connected between ground and the collector of said transistor, a biasing resistor connected between the emitter and the base of said transistor, one side of said alternating current source being connected to ground, a condenser having one side connected to the other side of said alternating current source and the other side connected to the base of said transistor, and a diode connecting the said other side of said alternating current source to a first point along said resistance means near said collector, a capacitor having one side connected to said first point, the other side of said capacitor and a second point along said resistance means near the ground forming output terminals for said circuit across which there is developed a frequency double that of the said alternating current source.
Claim 3
Dependent Claim
20 words
A frequency doubling circuit according to claim 1, in which said points are at the ends of said resistance means.
Claim 4
Dependent Claim
26 words
A frequency doubling circuit according to claim 2, which includes a second resistance means between the emitter of said transistor and said source of direct current.
Claim 5
Dependent Claim
24 words
A frequency doubling circuit according to claim 3, which includes a third resistance means between said first point and said source of alternating current.
Claim 6
Dependent Claim
61 words
A frequency doubling circuit according to claim 4, in which said transistor is a PNP transistor and the positive side of said direct current source is connected to the emitter of said transistor, and said diode is poled so as to be forwardly biased when the side of said source of alternating current which is connected to said diode goes positive.
Claim 7
Dependent Claim
60 words
A frequency doubling circuit according to claim 4, in which said transistor is an NPN transistor and the negative side of said direct current source is connected to the emitter of the transistor and said diode is poled so as to be forwardly biased when the side of said alternating current source which is connected to said diode goes negative.
Claim 8
Dependent Claim
19 words
A frequency doubling circuit according to claim 4, in which at least one of said resistance means is adjustable.
Claim 9
Dependent Claim
37 words
A frequency doubling circuit according to claim 4, in which said second resistance means has a value substantially equal to the sum of the values of said third resistance means and the said first mentioned resistance means.
References Cited (Backward Citations)
US3044004A
Cited
US3054068A
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US3089966A
Cited
US3320409A
Cited
US3330973A
Cited
US3411066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |