US3633128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relaxation oscillator with output frequency selectively shiftable between two limits
Assignee: Singer Co
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Filing: 1970-11-05
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Granted: 1972-01-04
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Expires: 1990-11-05
Abstract
Abstract The circuit of the present invention discloses a relaxation oscillator comprising a programmable unijunction transistor which is so controlled that the output frequency may be smoothly shifted between two limits. A first transistor circuit and associated resistors control the charge and discharge rate of a capacitor which is coupled to the anode, or trigger point, of the programmable unijunction transistor. The charge and discharge time of the said capacitor controls, in part, the output frequency. A second transistor circuit and associated resistor control the charge and discharge rate of a second capacitor coupled to the gate of the programmable unijunction transistor. The instantaneous magnitude of the potential of the gate of the programmable unijunction transistor is controlled by said second capacitor; and the magnitude of the voltage at the gate determines the magnitude of the voltage required at the trigger point to render the programmable unijunction transistor conducting.
Inventors
- 👤 Ernesto G Sevilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:26
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/35; H03K3/352; H03K3/3525
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A relaxation oscillator comprising: a. a programmable unijunction transistor having an anode, a cathode and a gate electrode; b. a load circuit coupled to said cathode; c. a direct-current power source; d. first control means for selectively applying a smoothly increasing potential from said power source to said anode electrode until said programmable unijunction transistor is rendered conducting from said anode to said cathode; and e. second control means coupled to said gate electrode for selectively controlling the potential at which said programmable unijunction transistor is rendered conductive from said anode to said cathode in response to the application of potential to said anode.
Claim 2
Dependent Claim
104 words
A relaxation oscillator comprising: a. a programmable unijunction transistor having an anode, a cathode and a gate electrode; b. a load circuit coupled to said cathode; c. a direct-current power source; d. first control means for selectively applying a smoothly increasing potential from said power source to said anode electrode until said programmable unijunction transistor is rendered conducting from said anode to said cathode; and e. second control means coupled to said gate electrode for selectively controlling the potential at which said programmable unijunction transistor is rendered conductive from said anode to said cathode in response to the application of potential to said anode.
Claim 3
Dependent Claim
32 words
The combination as set forth in claim 1 wherein said first control means includes a first capacitor which is charged from said power source until said programmabLe unijunction transistor is rendered conductive.
Claim 4
Dependent Claim
51 words
The combination as set forth in claim 2 wherein said second control means includes a second capacitor which is charged from said power source and wherein the instantaneous magnitude of the charge on said second capacitor controls the potential required on said first capacitor to render said programmable unijunction transistor conductive.
Claim 5
Dependent Claim
36 words
The combination as set forth in claim 3 wherein said first control means and said programmable unijunction transistor cooperate to form discharge means for discharging said first capacitor when said programmable unijunction transistor is rendered conductive.
Claim 6
Dependent Claim
53 words
The combination as set forth in claim 4 wherein said second control means has first and second stable states and wherein said second capacitor approaches a discharged and charged state as said second control means is switched from said first to said second and from said second to said first stable states, respectively.
Claim 7
Dependent Claim
38 words
The combination as set forth in claim 5 wherein said second control means includes first and second resistors and said second capacitor is charged in series with said first resistor and discharged in series with said second resistor.
Claim 8
Dependent Claim
33 words
The combination as set forth in claim 6 and including a unidirectional device in parallel with said second resistor for causing the charging current to said second capacitor to bypass said second resistor.
Claim 9
Dependent Claim
21 words
The combination as set forth in claim 7 wherein said first and second control means include first and second transistors, respectively.
Claim 10
Dependent Claim
27 words
The combination as set forth in claim 8 and including first and second individual means for selectively turning said first and second transistors off and on, respectively.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |