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US3887884A
Expired / Lapsed
US
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Relaxation oscillator
Assignee: Minolta Co Ltd
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Filing: 1973-03-19
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Granted: 1975-06-03
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Expires: 1993-03-19
Abstract
Abstract The frequency variation range of a relaxation oscillator utilizing a programmable unijunction transistor can be widened by feeding the gate of the programmable unijunction transistor with current derived from the emitter of a bi-polar transistor. No wasteful increase of current takes place with this improvement.
Inventors
- 👤 Takeshi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:30
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/35; H03K3/352; H03K3/3525; G; G03; G03B; G03B17/00; G03B17/02; G03B17/17; G03B19/00; G03B19/02; G03B19/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
A relaxation oscillator comprising a D.C. power source, a programmable unijunction transistor having an N-shaped anodevoltage-current characteristic, a timer circuit including a variable resistor and a capacitor connected in series across said power source, said capacitor being connected between the anode and cathode of said programmable unijunction transistor, a second transistor having its emitter connected to the gate of said programmable unijunction transistor, the collector of said second transistor being connected through a resistance to one end of said power source, a fixed resistor connecting the emitter of said second transistor to the other end of said power source, and a voltage divider having its respective ends connected across said power source and a central point providing a divided output connected to the base of said second transistor.
Claim 2
Dependent Claim
128 words
A relaxation oscillator comprising a D.C. power source, a programmable unijunction transistor having an N-shaped anodevoltage-current characteristic, a timer circuit including a variable resistor and a capacitor connected in series across said power source, said capacitor being connected between the anode and cathode of said programmable unijunction transistor, a second transistor having its emitter connected to the gate of said programmable unijunction transistor, the collector of said second transistor being connected through a resistance to one end of said power source, a fixed resistor connecting the emitter of said second transistor to the other end of said power source, and a voltage divider having its respective ends connected across said power source and a central point providing a divided output connected to the base of said second transistor.
Claim 3
Dependent Claim
128 words
A relaxation oscillator comprising a D.C. power source, a programmable unijunction transistor having an N-shaped anode-voltage-current characteristic, a timer circuit including a variable resistor and a capacitor connected in series across said power source, said capacitor being connected between the anode and cathode of said programmable unijunction transistor, a second transistor having its emitter connected to the gate of said programmable unijunction transistor, the collector of said second transistor being connected through a resistance to one end of said power source, a fixed resistor connecting the emitter of said second transistor to the other end of said power source, and a voltage divider having its respective ends connected across said power source and a central point providing a divided output connected to the base of said second transistor.
Claim 4
Dependent Claim
128 words
A relaxation oscillator comprising a D.C. power source, a programmable unijunction transistor having an N-shaped anode-voltage-current characteristic, a timer circuit including a variable resistor and a capacitor connected in series across said power source, said capacitor being connected between the anode and cathode of said programmable unijunction transistor, a second transistor having its emitter connected to the gate of said programmable unijunction transistor, the collector of said second transistor being connected through a resistance to one end of said power source, a fixed resistor connecting the emitter of said second transistor to the other end of said power source, and a voltage divider having its respective ends connected across said power source and a central point providing a divided output connected to the base of said second transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |