GB886298A - Improvements in or relating to circuit arrangements for changing the tuning of a resonant circuit - Google Patents
Improvements in or relating to circuit arrangements for changing the tuning of a resonant circuitInfo
- Publication number
- GB886298A GB886298A GB31674/60A GB3167460A GB886298A GB 886298 A GB886298 A GB 886298A GB 31674/60 A GB31674/60 A GB 31674/60A GB 3167460 A GB3167460 A GB 3167460A GB 886298 A GB886298 A GB 886298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- tuning
- changing
- resonant circuit
- relating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
- H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
- H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Electronic Switches (AREA)
Abstract
886,298. Radio receiver switch tuning arrangements. PHILIPS ELECTRICAL INDUSTRIES Ltd. Sept. 14, 1960 [Sept. 17, 1959], No. 31674/60. Classes 40(5) and 40(6). In a circuit for changing the tuning of a resonant circuit K in which a diode 6 is rendered conductive to connect a capacitor 1 across the circuit K, another diode 8 isolates the internal capacity of the control cable 4, 5 from capacitor 1 and therefore from the resonant circuit. A control potential 3 may be applied by switch 10 to a cable 4, 5 to tune circuit K to a number of pre-selected frequencies. The diodes used may be of the tunnel or pnpn type to reduce the power required for control.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN17258A DE1091627B (en) | 1959-09-17 | 1959-09-17 | Circuit arrangement for detuning a resonance circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
GB886298A true GB886298A (en) | 1962-01-03 |
Family
ID=7340365
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31674/60A Expired GB886298A (en) | 1959-09-17 | 1960-09-14 | Improvements in or relating to circuit arrangements for changing the tuning of a resonant circuit |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH381287A (en) |
DE (1) | DE1091627B (en) |
GB (1) | GB886298A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6239675B1 (en) * | 1995-04-28 | 2001-05-29 | Texas Instruments Incorporated | Tuning circuit having switchable capacitor controlled by a selection circuit |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3264566A (en) * | 1962-07-13 | 1966-08-02 | Gen Instrument Corp | Electronic switching of tuned circuits |
DE1266373C2 (en) * | 1964-02-01 | 1973-05-24 | Telefunken Patent | Tuning device for several separate frequency ranges |
DE4113708C2 (en) * | 1991-04-26 | 1995-10-05 | Telefunken Sendertechnik | Electronically switchable resonance circuit |
-
1959
- 1959-09-17 DE DEN17258A patent/DE1091627B/en active Pending
-
1960
- 1960-09-14 CH CH1040660A patent/CH381287A/en unknown
- 1960-09-14 GB GB31674/60A patent/GB886298A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6239675B1 (en) * | 1995-04-28 | 2001-05-29 | Texas Instruments Incorporated | Tuning circuit having switchable capacitor controlled by a selection circuit |
Also Published As
Publication number | Publication date |
---|---|
DE1091627B (en) | 1960-10-27 |
CH381287A (en) | 1964-08-31 |
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