GB1056265A - Improvements in or relating to automatic gain control circuits - Google Patents

Improvements in or relating to automatic gain control circuits

Info

Publication number
GB1056265A
GB1056265A GB3893762A GB3893762A GB1056265A GB 1056265 A GB1056265 A GB 1056265A GB 3893762 A GB3893762 A GB 3893762A GB 3893762 A GB3893762 A GB 3893762A GB 1056265 A GB1056265 A GB 1056265A
Authority
GB
United Kingdom
Prior art keywords
transistor
impedance
gain control
automatic gain
amplifier
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
GB3893762A
Inventor
John George Laycock Rhodes
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.)
SHIPTON ELECTRONICS Ltd
Original Assignee
SHIPTON ELECTRONICS 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 SHIPTON ELECTRONICS Ltd filed Critical SHIPTON ELECTRONICS Ltd
Priority to GB3893762A priority Critical patent/GB1056265A/en
Publication of GB1056265A publication Critical patent/GB1056265A/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
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1,056,265. Automatic volume control. SHIPTON ELECTRONICS Ltd. Oct. 15, 1963 [Oct. 15, 1962], No. 38937/62. Heading H4R. In an audio.frequency amplifier, particularly for feeding the recording head in a telephone answering machine, automatic gain control is provided by a transistor 6 whose emittercollector impedance is shunted across the amplifier input, which impedance is varied by the amplifier output which is rectified in bridge rectifier 7, smoothed in filter R6, C3 and R5, and applied to the base of transistor 6. The transistor bias being arranged so that the transistor is cut off until the amplifier output reaches a predetermined value, any further increase resulting in a reduction of the emittercollector impedance thus tending to maintain the output constant at the predetermined value.
GB3893762A 1962-10-15 1962-10-15 Improvements in or relating to automatic gain control circuits Expired GB1056265A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3893762A GB1056265A (en) 1962-10-15 1962-10-15 Improvements in or relating to automatic gain control circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3893762A GB1056265A (en) 1962-10-15 1962-10-15 Improvements in or relating to automatic gain control circuits

Publications (1)

Publication Number Publication Date
GB1056265A true GB1056265A (en) 1967-01-25

Family

ID=10406602

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3893762A Expired GB1056265A (en) 1962-10-15 1962-10-15 Improvements in or relating to automatic gain control circuits

Country Status (1)

Country Link
GB (1) GB1056265A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123231A (en) * 1982-06-17 1984-01-25 Ates Componenti Elettron Gain control of audio-amplifying systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123231A (en) * 1982-06-17 1984-01-25 Ates Componenti Elettron Gain control of audio-amplifying systems

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