US3644844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multivibrator circuits
Assignee: Bull SAS
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Filing: 1970-01-29
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Granted: 1972-02-22
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Expires: 1990-01-29
Abstract
Abstract A transistorized multivibrator for furnishing output pulses having steep edges which are independent of the duration of the pulses, wherein each of a pair of branches comprises two interconnected transistors of opposite conductivity type and a resistor, and wherein a single capacitor is coupled between the two branches to function with each of the resistors as a common element in two time-constant circuits.
Inventors
- 👤 Atanasije Bankovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:05
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2821
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
199 words
In a multivibrator circuit having its active and passive members supplied by a voltage source and connected in two similar branches, each branch having at least two transistors of opposite conductivity types, the improvement comprising: in each branch a first transistor of one type of conductivity having its emitter connected to a first terminal of a first direct voltage source through a resistor adapted to constitute a time-constant network, a second transistor of the opposite type of conductivity having its emitter directly connected to a second terminal of said first voltage source, having its collector directly connected to a corresponding output terminal of the circuit and coupled to the base of the first transistor, said base of said first transistor being connected through a diode for unilateral conduction to a source of reference voltage, said second transistor having its base connected through an appropriate circuit means to said second terminal of said first voltage source; and a capacitor being connected between the emitters of said first transistors of the two branches and having a capacitance which is a function of the values of said resistors and determines the durations of the two time intervals of a cycle of operation.
Claim 2
Dependent Claim
199 words
In a multivibrator circuit having its active and passive members supplied by a voltage source and connected in two similar branches, each branch having at least two transistors of opposite conductivity types, the improvement comprising: in each branch a first transistor of one type of conductivity having its emitter connected to a first terminal of a first direct voltage source through a resistor adapted to constitute a time-constant network, a second transistor of the opposite type of conductivity having its emitter directly connected to a second terminal of said first voltage source, having its collector directly connected to a corresponding output terminal of the circuit and coupled to the base of the first transistor, said base of said first transistor being connected through a diode for unilateral conduction to a source of reference voltage, said second transistor having its base connected through an appropriate circuit means to said second terminal of said first voltage source; and a capacitor being connected between the emitters of said first transistors of the two branches and having a capacitance which is a function of the values of said resistors and determines the durations of the two time intervals of a cycle of operation.
Claim 3
Dependent Claim
48 words
The multivibrator circuit of claim 1, wherein, in eaCh branch, the base of the second transistor and the collector of the first transistor are connected together and through said circuit means to said second terminal of said first voltage source, and wherein said circuit means is a resistor.
Claim 4
Dependent Claim
97 words
The multivibrator circuit of claim 1, wherein each branch comprises a third transistor which is of the same type of conductivity as the second transistor, and wherein in each branch, the base of the second transistor is connected both through a resistor to said first terminal of said first voltage source and to the collector of the third transistor, the emitter of the third transistor is connected to said second terminal of said first voltage source, and the base of the third transistor is directly connected to the collector of the first transistor of the other branch.
Claim 5
Dependent Claim
61 words
The multivibrator circuit of claim 3, wherein a control switch is adapted to connect the base of the third transistor of one branch through a low-valued resistance to the second terminal of said first voltage source, in order to impose a state of rest on the circuit, in which state the first and second transistors of the same branch are conductive.
Claim 6
Dependent Claim
42 words
The multivibrator circuit of claim 4, wherein said source of reference voltage comprises a voltage divider branch between the first and second terminals of said first voltage source, which voltage divider branch includes a variable resistance to furnish an adjustable intermediate voltage.
Claim 7
Dependent Claim
20 words
The multivibrator circuit of claim 2, further including control switching means selectively adapted to render one of said branches nonconducting.
Claim 8
Dependent Claim
156 words
A multivibrator supplied by a voltage source having first and second terminals supplying a voltage difference therebetween, comprising: a pair of like branches connected between said terminals; each of said branches comprising a resistor connected to said first terminal and first and second transistors of opposite conductivity type connected between said resistor and said second terminal, the base of said first transistor being coupled to the collector of said second transistor, and the collector of said first transistor being coupled to the base of said second transistor in each of said branches, the emitter of said first transistor being coupled to said resistor and the emitter of said second transistor being coupled to said second terminal in each of said branches; a controllable source of reference voltage, means coupling the base of a corresponding one of said transistors in each branch to said controllable source; and a capacitor coupled between the emitters of said first transistors.
Claim 9
Dependent Claim
156 words
A multivibrator supplied by a voltage source having first and second terminals supplying a voltage difference therebetween, comprising: a pair of like branches connected between said terminals; each of said branches comprising a resistor connected to said first terminal and first and second transistors of opposite conductivity type connected between said resistor and said second terminal, the base of said first transistor being coupled to the collector of said second transistor, and the collector of said first transistor being coupled to the base of said second transistor in each of said branches, the emitter of said first transistor being coupled to said resistor and the emitter of said second transistor being coupled to said second terminal in each of said branches; a controllable source of reference voltage, means coupling the base of a corresponding one of said transistors in each branch to said controllable source; and a capacitor coupled between the emitters of said first transistors.
Claim 10
Dependent Claim
22 words
The multivibrator of claim 7 further including means coupled to one of said branches to selectively halt conduction in said one branch.
Claim 11
Dependent Claim
60 words
The multivibrator circuit of claim 6, wherein said control switching means is adapted to connect the base of the second transistor of one branch through a low resistance to the second terminal of said first voltage source, in order to impose a state of rest on the circuit, in which state the two transistors of the other branch are conductive.
Claim 12
Dependent Claim
42 words
The multivibrator circuit of claim 6, wherein said source of reference voltage comprises a voltage divider branch between the first and second terminals of said first voltage source, which voltage divider branch includes a variable resistance to furnish an adjustable intermediate voltage.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |