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GB997978A - Amplifier regulation - Google Patents

Amplifier regulation

Info

Publication number
GB997978A
GB997978A GB796764A GB796764A GB997978A GB 997978 A GB997978 A GB 997978A GB 796764 A GB796764 A GB 796764A GB 796764 A GB796764 A GB 796764A GB 997978 A GB997978 A GB 997978A
Authority
GB
United Kingdom
Prior art keywords
level
amplifier
resistance
pilot
value
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
GB796764A
Inventor
Donald Robert Barber
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority to GB796764A priority Critical patent/GB997978A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US433998A priority patent/US3510793A/en
Priority to NL6502215A priority patent/NL6502215A/xx
Priority to DEST23409A priority patent/DE1233915B/en
Priority to CH250265A priority patent/CH427917A/en
Priority to BE660269D priority patent/BE660269A/xx
Priority to FR7189A priority patent/FR1426509A/en
Publication of GB997978A publication Critical patent/GB997978A/en
Priority to DE19671512711 priority patent/DE1512711B2/en
Priority to US637416A priority patent/US3441866A/en
Priority to FR106229A priority patent/FR92450E/en
Priority to SE06672/67A priority patent/SE337238B/xx
Priority to BE698388D priority patent/BE698388A/xx
Priority to CH678167A priority patent/CH462896A/en
Priority to NL6706646A priority patent/NL6706646A/xx
Priority to GB1265108D priority patent/GB1265108A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Networks Using Active Elements (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

997,978. Automatic volume control circuits. STANDARD TELEPHONES & CABLES Ltd. Feb. 26, 1964, No. 7967/64. Heading H4R. [Also in Division HI] In an automatic volume control circuit the gain of an amplifier is controlled by an electrolytic variable resistance device. The Figure shows an amplifier 2 whose gain is controlled by the level of a pilot signal which is selected, amplified, and rectified in the pilot selector 4. The resulting D.C. level is compared with a reference level in the comparator circuit comprising transistors 5 and 6 and difference in the levels causes current to flow from the collector of one transistor to the collector of the other transistor through the electrolytic variable resistance device 8. The flow of current in the device 8 causes the plating, or deplating, of a layer of copper on the surface of a carbon substrate 12 from, or to, the copper electrode 11 via the copper sulphate electrolyte, thus reducing, or increasing, the value of the resistance between terminals 13 and 14. The resistance between terminals 13 and 14 is connected, via transformer 9, in the equalizer network 3 across the input to the amplifier 2, and a change in the value of the resistance produces a change in the attenuation of the equalizer network, tending to maintain the level of the pilot signal at the output of the amplifier constant. Relay contacts 15 are provided which are controlled, by means not shown, to open on an abnormally large deviation of the pilot level, such as may be due to a fault in the pilot circuit, so that, for the duration of such a condition no plating or deplating current can flow in the device 8 and the value of resistance 12 is maintained at its last known value.
GB796764A 1964-02-26 1964-02-26 Amplifier regulation Expired GB997978A (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
GB796764A GB997978A (en) 1964-02-26 1964-02-26 Amplifier regulation
US433998A US3510793A (en) 1964-02-26 1965-02-19 Amplifier regulator employing an electrolytic variable resistance device
NL6502215A NL6502215A (en) 1964-02-26 1965-02-22
DEST23409A DE1233915B (en) 1964-02-26 1965-02-23 Circuit arrangement for the pilot control of amplifiers in transmission systems
CH250265A CH427917A (en) 1964-02-26 1965-02-24 Transmission device with an amplifier
BE660269D BE660269A (en) 1964-02-26 1965-02-26
FR7189A FR1426509A (en) 1964-02-26 1965-02-26 Control device for powerline transmission system
DE19671512711 DE1512711B2 (en) 1964-02-26 1967-05-09 ARRANGEMENT FOR PILOT-CONTROLLED GAIN CONTROL OF AMPLIFIERS, IN PARTICULAR INTERAMPLIFIER OF CARRIER FREQUENCY TECHNOLOGY
US637416A US3441866A (en) 1964-02-26 1967-05-10 Amplifier regulation
FR106229A FR92450E (en) 1964-02-26 1967-05-12 Control device for powerline transmission system
SE06672/67A SE337238B (en) 1964-02-26 1967-05-12
BE698388D BE698388A (en) 1964-02-26 1967-05-12
CH678167A CH462896A (en) 1964-02-26 1967-05-12 Arrangement for pilot-controlled gain control of amplifiers, in particular intermediate amplifiers in carrier frequency technology
NL6706646A NL6706646A (en) 1964-02-26 1967-05-12
GB1265108D GB1265108A (en) 1964-02-26 1970-09-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB796764A GB997978A (en) 1964-02-26 1964-02-26 Amplifier regulation

Publications (1)

Publication Number Publication Date
GB997978A true GB997978A (en) 1965-07-14

Family

ID=9843223

Family Applications (1)

Application Number Title Priority Date Filing Date
GB796764A Expired GB997978A (en) 1964-02-26 1964-02-26 Amplifier regulation

Country Status (1)

Country Link
GB (1) GB997978A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488750A (en) * 1966-05-12 1970-01-06 Akai Electric Automatic sound volume control arrangement preserving relative magnitudes of input signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488750A (en) * 1966-05-12 1970-01-06 Akai Electric Automatic sound volume control arrangement preserving relative magnitudes of input signals

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