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GB1367244A - Amplifier gain control - Google Patents

Amplifier gain control

Info

Publication number
GB1367244A
GB1367244A GB110872*[A GB110872A GB1367244A GB 1367244 A GB1367244 A GB 1367244A GB 110872 A GB110872 A GB 110872A GB 1367244 A GB1367244 A GB 1367244A
Authority
GB
United Kingdom
Prior art keywords
resistor
gain control
transistor
source
colour television
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
GB110872*[A
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.)
EMI Group Ltd
Original Assignee
Thorn Electrical Industries 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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Priority to GB110872*[A priority Critical patent/GB1367244A/en
Priority to ZA729140A priority patent/ZA729140B/en
Priority to DE2300296A priority patent/DE2300296A1/en
Priority to AU50875/73A priority patent/AU470064B2/en
Priority to SE7300237A priority patent/SE386349B/en
Publication of GB1367244A publication Critical patent/GB1367244A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1367244 Gain control; colour television THORN ELECTRICAL INDUSTRIES Ltd 27 Dec 1972 [10 Jan 1972] 1108/72 Headings H3T and H4F An amplifier in which the gain can be varied without a corresponding variation in the D.C. level of the output comprises a transistor 20 with signal input applied to its base 21 and having a collector load resistor 26, the output being at terminal 27. The emitter circuit comprises a resistor 28 connected to the slider of a potentiometer 31, one end of which is connected to earth via a resistor 32 and the other to a point of fixed bias potential. In the embodiment shown the source of bias potential comprises a Zener diode 38 connected to a source of fixed potential 36 via resistor 37, so that temperature compensation is provided for the characteristics of the transistor 20. The arrangement is more particularly intended for use in setting up correctly the grey scale in a colour television receiver using a triple beam tube.
GB110872*[A 1972-01-10 1972-01-10 Amplifier gain control Expired GB1367244A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB110872*[A GB1367244A (en) 1972-01-10 1972-01-10 Amplifier gain control
ZA729140A ZA729140B (en) 1972-01-10 1972-12-28 Amplifier gain control
DE2300296A DE2300296A1 (en) 1972-01-10 1973-01-04 REGULATING AMPLIFIER CIRCUIT
AU50875/73A AU470064B2 (en) 1972-01-10 1973-01-08 Amplifier gain control
SE7300237A SE386349B (en) 1972-01-10 1973-01-09 COUPLING FOR AN AMPLIFIER WITH VARIABLE GAIN

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB110872*[A GB1367244A (en) 1972-01-10 1972-01-10 Amplifier gain control

Publications (1)

Publication Number Publication Date
GB1367244A true GB1367244A (en) 1974-09-18

Family

ID=9716311

Family Applications (1)

Application Number Title Priority Date Filing Date
GB110872*[A Expired GB1367244A (en) 1972-01-10 1972-01-10 Amplifier gain control

Country Status (5)

Country Link
AU (1) AU470064B2 (en)
DE (1) DE2300296A1 (en)
GB (1) GB1367244A (en)
SE (1) SE386349B (en)
ZA (1) ZA729140B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3161721B2 (en) * 1990-10-19 2001-04-25 株式会社日立製作所 Amplifier circuit and display device

Also Published As

Publication number Publication date
AU5087573A (en) 1974-07-11
DE2300296A1 (en) 1973-09-20
ZA729140B (en) 1973-10-31
AU470064B2 (en) 1976-03-04
SE386349B (en) 1976-08-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19921225