GB551981A - Improvements in or relating to thermionic valve circuits for generating or amplifying a control voltage - Google Patents

Improvements in or relating to thermionic valve circuits for generating or amplifying a control voltage

Info

Publication number
GB551981A
GB551981A GB965941A GB965941A GB551981A GB 551981 A GB551981 A GB 551981A GB 965941 A GB965941 A GB 965941A GB 965941 A GB965941 A GB 965941A GB 551981 A GB551981 A GB 551981A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
control voltage
potential
cathode
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
GB965941A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Priority to GB965941A priority Critical patent/GB551981A/en
Publication of GB551981A publication Critical patent/GB551981A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers
    • H03G5/20—Automatic control in untuned amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant

Landscapes

  • Amplifiers (AREA)

Abstract

551,981. Automatic volume control. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). July 29, 1941, No. 9659. [Class 40 (v)] A circuit for deriving or amplifying a control voltage comprises a valve to the control grid of which is applied the control voltage to be amplified or the voltage from which the control voltage is to be derived the derived or the amplified control voltage being taken,from the secondary emitting auxiliary cathode. In Fig. 1 the negative voltage from the diode load 8 is fed through resistance 10 to the grid of a valve 12 having an auxiliary cathode 13 connected through resistance 15 to a positive potential, and through lead 17 and resistance 18 to the grid of an intermediate frequency amplifier 2, the cathode of which is maintained at a higher potential relative to earth than a cathode 13 by a potentiometer 22. Thus the potential of auxiliary cathode 13 decreases with increased signal strength and controls the gain of valve 2 to keep the signal constant. The valve 12'may also serve as an audio-frequency amplifier by connecting a tap 8 on the diode load 6 through a condenser 9 to the grid of 12 the output being taken from the anode 14. Fig. 3 shows an arrangement for producing volume expansion. The audiofrequency signal is applied from terminals 25, 26 to the grid of an audio amplifier 29 and also to the grid of a valve 27 arranged as an anode detector. The amplification of valve 29 depends on the potential of the screen 32 which is connected to the auxiliary cathode of valve 27 the potential of which varies with the strength of the applied signal. This arrangement gives volume expansion.
GB965941A 1941-07-29 1941-07-29 Improvements in or relating to thermionic valve circuits for generating or amplifying a control voltage Expired GB551981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB965941A GB551981A (en) 1941-07-29 1941-07-29 Improvements in or relating to thermionic valve circuits for generating or amplifying a control voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB965941A GB551981A (en) 1941-07-29 1941-07-29 Improvements in or relating to thermionic valve circuits for generating or amplifying a control voltage

Publications (1)

Publication Number Publication Date
GB551981A true GB551981A (en) 1943-03-18

Family

ID=9876262

Family Applications (1)

Application Number Title Priority Date Filing Date
GB965941A Expired GB551981A (en) 1941-07-29 1941-07-29 Improvements in or relating to thermionic valve circuits for generating or amplifying a control voltage

Country Status (1)

Country Link
GB (1) GB551981A (en)

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