Patent US3699466A successfully refreshed from Google Patents.
US3699466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single ended push-pull amplifier
Assignee: Nippon Gakki Co Ltd
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Filing: 1971-02-17
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Granted: 1972-10-17
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Expires: 1991-02-17
Abstract
Abstract In order to facilitate bias adjustment in a single ended pushpull amplifier comprising first and second transistors connected in series between a power source and the ground, a circuit including a capacitor and load connected in series between the juncture of the first and second transistors and the ground, at least one circuit including of a plurality of resistors, one resistor being a variable one, connected in series between the power source and the ground so as to supply bias voltage to the first and second transistors, and an input transformer having first and second secondary windings so as to actuate upon receipt of signals the first and second transistors alternately; there is connected a DC blocking capacitor between the bias voltage supplying point included in the aforesaid resistor series circuit to the first transistor and the juncture of the first and second transistors, and voltage across the variable resistor included in the series circuit is supplied to the second transistor as bias voltage. The single variable resistor adjusts the proper operating condition.
Inventors
- 👤 Yasuji Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:30
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3083; H03F3/3086; H03F3/3098
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
191 words
A single ended push-pull amplifier comprising: first and second transistors connected in series between a power source and ground potential; an output circuit including a capacitor and a load connected in series between the juncture of said first and second transistors and ground potential; a bias circuit including first, second and third series connected resistances, at least said third resistance being variable, said series connected resistances being coupled between the power source and ground potential; an input transformer including a primary winding receiving input signals and first and second secondary windings coupled to said transistors to alternately operate said transistors upon receipt of said input signals; and a capacitor connected between said bias circuit and the juncture of said first and second transistors; said first and second resistances being connected directly to each other and the juncture of said first and second resistances being connected to the base of said first transistor through said first secondary winding and to the juncture of said first and second transistors through said capacitor, and one terminal of said third variable resistor being connected to the base of said second transistor through said secondary winding.
Claim 2
Dependent Claim
191 words
A single ended push-pull amplifier comprising: first and second transistors connected in series between a power source and ground potential; an output circuit including a capacitor and a load connected in series between the juncture of said first and second transistors and ground potential; a bias circuit including first, second and third series connected resistances, at least said third resistance being variable, said series connected resistances being coupled between the power source and ground potential; an input transformer including a primary winding receiving input signals and first and second secondary windings coupled to said transistors to alternately operate said transistors upon receipt of said input signals; and a capacitor connected between said bias circuit and the juncture of said first and second transistors; said first and second resistances being connected directly to each other and the juncture of said first and second resistances being connected to the base of said first transistor through said first secondary winding and to the juncture of said first and second transistors through said capacitor, and one terminal of said third variable resistor being connected to the base of said second transistor through said secondary winding.
Claim 3
Dependent Claim
15 words
The amplifier according to claim 1 wherein said first and second resistances are fixed resistors.
Claim 4
Dependent Claim
41 words
The amplifier according to claim 1 wherein said bias circuit further comprises a bias stabilizing element including a diode between said one terminal and another terminal of said third variable resistor in the forward direction with respect to the supply voltage.
Claim 5
Dependent Claim
28 words
The amplifier according to claim 1 wherein said bias circuit further comprises an additional capacitor coupled between said one terminal and another terminal of said third variable resistor.
Claim 6
Dependent Claim
27 words
The amplifier according to claim 1 wherein said bias circuit further cOmprises a thermistor coupled between said one terminal and another terminal of said third variable resistor.
Claim 7
Dependent Claim
175 words
A single ended push-pull amplifier comprising: first and second transistors connected in series between a power source and ground potential; an output circuit including a capacitor and a load connected in series between the juncture of said first and second transistors and ground potential; a bias circuit including first, second and third series connected resistances, at least said third resistance being variable, said series connected resistances being coupled between the power source and ground potential; an input transformer including a primary winding receiving input signals and first and second secondary windings coupled to said transistors to alternately operate said transistors upon receipt of said input signals; and a capacitor connected between said bias circuit and the juncture of said first and second transistors; said first and second resistances being connected directly to each other and the juncture of said two fixed resistors being connected directly to the base of said first transistor and also to the juncture of said first and second transistors through the series connection of said capacitor and said first secondary winding.
Claim 8
Dependent Claim
175 words
A single ended push-pull amplifier comprising: first and second transistors connected in series between a power source and ground potential; an output circuit including a capacitor and a load connected in series between the juncture of said first and second transistors and ground potential; a bias circuit including first, second and third series connected resistances, at least said third resistance being variable, said series connected resistances being coupled between the power source and ground potential; an input transformer including a primary winding receiving input signals and first and second secondary windings coupled to said transistors to alternately operate said transistors upon receipt of said input signals; and a capacitor connected between said bias circuit and the juncture of said first and second transistors; said first and second resistances being connected directly to each other and the juncture of said two fixed resistors being connected directly to the base of said first transistor and also to the juncture of said first and second transistors through the series connection of said capacitor and said first secondary winding.
Claim 9
Dependent Claim
15 words
The amplifier according to claim 6 wherein said first and second resistances are fixed resistors.
Claim 10
Dependent Claim
41 words
The amplifier according to claim 6 wherein said bias circuit further comprises a bias stabilizing element including a diode between said one terminal and another terminal of said third variable resistor in the forward direction with respect to the supply voltage.
Claim 11
Dependent Claim
28 words
The amplifier according to claim 6 wherein said bias circuit further comprises an additional capacitor coupled between said one terminal and another terminal of said third variable resistor.
Claim 12
Dependent Claim
27 words
The amplifier according to claim 6 wherein said bias circuit further comprises a thermistor coupled between said one terminal and another terminal of said third variable resistor.
References Cited (Backward Citations)
US3050644A
Cited
US3234479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |