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US4025877A
Expired / Lapsed
US
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Multi-stage astable multivibrator
Assignee: NIPPON ELECTRONICS MEMORY IND CO Ltd
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Filing: 1975-07-08
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Granted: 1977-05-24
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Expires: 1995-07-08
Abstract
Abstract A multi-stage astable multivibrator wherein a plurality of astable multivibrators each consisting of two transistors are connected in parallel so that a high output may be derived and a completely rectangular output waveform may be obtained. Diodes are connected to the emitters of the transistors so that the breakdown of the transistors may be prevented.
Inventors
- 👤 Hirohito Hara
- 👤 Hironori Shimamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:25
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2823
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A multi-stage astable multivibrator comprising (a) first and second NPN transistors with the collectors of said first and second NPN transistors connected to the bases of the second and first NPN transistors, respectively, through a parallel circuit consisting of a resistor and a capacitor, and (b) third and fourth NPN transistors with their collectors D.C. coupled to the emitters of said first and second NPN transistors, respectively, and with the collectors of said third and fourth NPN transistors connected to the bases of said fourth and third NPN transistors, respectively, through a capacitor and the bases of said third and fourth NPN transistors connected through resistors to a power supply.
Claim 2
Dependent Claim
110 words
A multi-stage astable multivibrator comprising (a) first and second NPN transistors with the collectors of said first and second NPN transistors connected to the bases of the second and first NPN transistors, respectively, through a parallel circuit consisting of a resistor and a capacitor, and (b) third and fourth NPN transistors with their collectors D.C. coupled to the emitters of said first and second NPN transistors, respectively, and with the collectors of said third and fourth NPN transistors connected to the bases of said fourth and third NPN transistors, respectively, through a capacitor and the bases of said third and fourth NPN transistors connected through resistors to a power supply.
Claim 3
Dependent Claim
128 words
A multi-stage astable multivibrator comprising (a) first and second transistors with the collectors of said first and second transistors connected to the bases of the second and first transistors, respectively, through a parallel circuit consisting of a resistor and a capacitor; and (b) third and fourth transistors with their collectors connected to the emitters of said first and second transistors, respectively, through diode means, and with the collectors of said third and fourth transistors connected to the bases of said fourth and third transistors, respectively, through a capacitor, the bases of said third and fourth transistors connected through resistors to one terminal of a power supply, and the emitters of said third and fourth transistors, each being connected through diode means to another terminal of said power supply.
Claim 4
Dependent Claim
128 words
A multi-stage astable multivibrator comprising (a) first and second transistors with the collectors of said first and second transistors connected to the bases of the second and first transistors, respectively, through a parallel circuit consisting of a resistor and a capacitor; and (b) third and fourth transistors with their collectors connected to the emitters of said first and second transistors, respectively, through diode means, and with the collectors of said third and fourth transistors connected to the bases of said fourth and third transistors, respectively, through a capacitor, the bases of said third and fourth transistors connected through resistors to one terminal of a power supply, and the emitters of said third and fourth transistors, each being connected through diode means to another terminal of said power supply.
Claim 5
Dependent Claim
28 words
A multi-stage astable multivibrator as set forth in claim 2 wherein a resistor is inserted between the base and emitter of each of said third and fourth transistors.
Claim 6
Dependent Claim
48 words
A multi-stage astable multivibrator as set forth in claim 2 wherein the collectors of said first and second transistors are connected through resistor means to the collectors of said third and fourth transistors, respectively; and the collectors of said third and fourth transistors are grounded through resistor means.
References Cited (Backward Citations)
US2874315A
Cited
US3559096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |