GB801254A - Improvements in or relating to d.c. amplifiers - Google Patents

Improvements in or relating to d.c. amplifiers

Info

Publication number
GB801254A
GB801254A GB3659255A GB3659255A GB801254A GB 801254 A GB801254 A GB 801254A GB 3659255 A GB3659255 A GB 3659255A GB 3659255 A GB3659255 A GB 3659255A GB 801254 A GB801254 A GB 801254A
Authority
GB
United Kingdom
Prior art keywords
channel
amplifier
circuit
channels
fed
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
GB3659255A
Inventor
Denis Edward Urry
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.)
Rank Cintel Ltd
Original Assignee
Rank Cintel 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 Rank Cintel Ltd filed Critical Rank Cintel Ltd
Priority to GB3659255A priority Critical patent/GB801254A/en
Publication of GB801254A publication Critical patent/GB801254A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/34—DC amplifiers in which all stages are DC-coupled
    • H03F3/36—DC amplifiers in which all stages are DC-coupled with tubes only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

801,254. Automatic amplitude control systems. RANK CINTEL, Ltd. Dec. 21, 1956 [Dec. 21, 1955], No. 36592/55. Class 38 (4). [Also in Group XL (c)] A zero-frequency amplifier comprises two channels, capable of providing equal gain, used alternately, wherein the D.C. level in either channel is determined and corrected during the time the other is operating. As shown, the input 1 is fed to cathode followers 2 in the two channels A, B, each channel comprising three D.C. amplifiers 6, 7, 8 in cascade. The output 10 is selected by means of a circuit 9 alternately from each channel depending on the polarity of a 50: 50 square wave fed to terminal 11. Shortly after channel A ceases to function, the input of amplifier 6 of channel B, which may be a cathode-coupled pair, is earthed by relay 3. The output of amplifier 8 is now compared with a reference level in circuit 12 and a correction voltage generated by circuit 13, which is rendered operative by a pulse at terminal 14, is fed to amplifier 6. Relay 3 is now released and the outputs of the two channels are compared by circuit 15, any difference being corrected by adjustment of gain of amplifier 8 by means of the control signal generator 16, rendered operative by a pulse at terminal 17. The square wave 11 now changes polarity causing the output to be taken from channel B while any drift in channel A is being corrected. Channel A has fixed or manually variable gain. The control pulses may have a low frequency and may be generated by relay circuits, but the 50: 50 square wave which must have a fast transition should be generated electronically.
GB3659255A 1955-12-21 1955-12-21 Improvements in or relating to d.c. amplifiers Expired GB801254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3659255A GB801254A (en) 1955-12-21 1955-12-21 Improvements in or relating to d.c. amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3659255A GB801254A (en) 1955-12-21 1955-12-21 Improvements in or relating to d.c. amplifiers

Publications (1)

Publication Number Publication Date
GB801254A true GB801254A (en) 1958-09-10

Family

ID=10389535

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3659255A Expired GB801254A (en) 1955-12-21 1955-12-21 Improvements in or relating to d.c. amplifiers

Country Status (1)

Country Link
GB (1) GB801254A (en)

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