GB1188294A - Switching Circuit - Google Patents

Switching Circuit

Info

Publication number
GB1188294A
GB1188294A GB3775966A GB3775966A GB1188294A GB 1188294 A GB1188294 A GB 1188294A GB 3775966 A GB3775966 A GB 3775966A GB 3775966 A GB3775966 A GB 3775966A GB 1188294 A GB1188294 A GB 1188294A
Authority
GB
United Kingdom
Prior art keywords
tuned
circuits
frequencies
base
aug
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
Application number
GB3775966A
Inventor
James Hugh Wharton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TELEVISION INSTR Ltd
Original Assignee
TELEVISION INSTR Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TELEVISION INSTR Ltd filed Critical TELEVISION INSTR Ltd
Priority to GB3775966A priority Critical patent/GB1188294A/en
Publication of GB1188294A publication Critical patent/GB1188294A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/64—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors having inductive loads
    • 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
    • H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will

Abstract

1,188,294. Frequency sensitive switching circuits; television. TELEVISION INSTRUMENTS Ltd. 2 Aug., 1967 [23 Aug., 1966], No. 37759/66. Headings H3P, H3T and H4F. Selection of line time-base circuits operating at first and second frequencies (e.g. 405 and 625) is controlled by a valve or transistor having sync pulses applied to its grid or base and a circuit connected to its cathode or emitter tuned to one of the frequencies. The circuit is parallel tuned and produces degeneration at the tuned frequency so that only at the other does sufficient current flow to operate a relay selecting the time base circuits. Additional tuned circuits could effect switching between further frequencies.
GB3775966A 1966-08-23 1966-08-23 Switching Circuit Expired GB1188294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3775966A GB1188294A (en) 1966-08-23 1966-08-23 Switching Circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3775966A GB1188294A (en) 1966-08-23 1966-08-23 Switching Circuit

Publications (1)

Publication Number Publication Date
GB1188294A true GB1188294A (en) 1970-04-15

Family

ID=10398807

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3775966A Expired GB1188294A (en) 1966-08-23 1966-08-23 Switching Circuit

Country Status (1)

Country Link
GB (1) GB1188294A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148652A (en) * 1983-09-15 1985-05-30 Sinclair Res Ltd Television receivers
USRE33916E (en) * 1984-07-16 1992-05-05 International Business Machines Corporation Digital display system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2148652A (en) * 1983-09-15 1985-05-30 Sinclair Res Ltd Television receivers
USRE33916E (en) * 1984-07-16 1992-05-05 International Business Machines Corporation Digital display system

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed