GB908967A - Voltage-limiting circuit - Google Patents

Voltage-limiting circuit

Info

Publication number
GB908967A
GB908967A GB604858A GB604858A GB908967A GB 908967 A GB908967 A GB 908967A GB 604858 A GB604858 A GB 604858A GB 604858 A GB604858 A GB 604858A GB 908967 A GB908967 A GB 908967A
Authority
GB
United Kingdom
Prior art keywords
voltage
collector
transistor
base
feb
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
GB604858A
Inventor
Robert Ernest Blaise
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.)
DICTAPHONE Co Ltd
Original Assignee
DICTAPHONE Co 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 DICTAPHONE Co Ltd filed Critical DICTAPHONE Co Ltd
Priority to GB604858A priority Critical patent/GB908967A/en
Priority to FR787646A priority patent/FR1217501A/en
Priority to CH7005159A priority patent/CH368823A/en
Publication of GB908967A publication Critical patent/GB908967A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices
    • 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)
  • Amplifiers (AREA)

Abstract

908,967. Automatic volume control. DICTAPHONE CO. Ltd. Feb. 20, 1959 [Feb. 25, 1958], No. 6048/58. Class 40 (4). A variable voltage of audio-frequency is connected across a potential divider one element of which is the collector emitter circuit of a transistor the base of which is biased by the variable voltage so that the collector emitter impedance falls as the voltage increases in amplitude. As shown, audio frequency is fed from terminals 1, 4, to a transformer with a tapped secondary winding. A resistor 8 and the collector emitter circuit of transistor T shunt part of the secondary winding, the whole of which is connected to feed a rectifier 11 providing bias to the transistor base. Output is taken from across emitter and collector and has a constant voltage. The transistor operates in the region of zero base bias and zero collector voltage.
GB604858A 1958-02-25 1958-02-25 Voltage-limiting circuit Expired GB908967A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB604858A GB908967A (en) 1958-02-25 1958-02-25 Voltage-limiting circuit
FR787646A FR1217501A (en) 1958-02-25 1959-02-25 Voltage limiter circuit
CH7005159A CH368823A (en) 1958-02-25 1959-02-25 Voltage limiter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB604858A GB908967A (en) 1958-02-25 1958-02-25 Voltage-limiting circuit

Publications (1)

Publication Number Publication Date
GB908967A true GB908967A (en) 1962-10-24

Family

ID=9807462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB604858A Expired GB908967A (en) 1958-02-25 1958-02-25 Voltage-limiting circuit

Country Status (3)

Country Link
CH (1) CH368823A (en)
FR (1) FR1217501A (en)
GB (1) GB908967A (en)

Also Published As

Publication number Publication date
FR1217501A (en) 1960-05-04
CH368823A (en) 1963-04-30

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