GB682189A - Improvements in or relating to arrangements for varying the amplitude of generated oscillations - Google Patents

Improvements in or relating to arrangements for varying the amplitude of generated oscillations

Info

Publication number
GB682189A
GB682189A GB2708649A GB2708649A GB682189A GB 682189 A GB682189 A GB 682189A GB 2708649 A GB2708649 A GB 2708649A GB 2708649 A GB2708649 A GB 2708649A GB 682189 A GB682189 A GB 682189A
Authority
GB
United Kingdom
Prior art keywords
output
oscillator
rectified
circuit
pilot
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
GB2708649A
Inventor
Charles Trevor Daly
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2708649A priority Critical patent/GB682189A/en
Publication of GB682189A publication Critical patent/GB682189A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency

Landscapes

  • Amplifiers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

682,189. Automatic volume control. STANDARD TELEPHONES & CABLES, Ltd. Oct. 21, 1949, No. 27086/49. Class 40 (iv). [Also in Group XL (c)] In a telephone repeater system having its gain controlled by a thermistor heated by the output of an oscillator, the amplitude of which is controlled by a pilot signal, the oscillator has its output controlled by the rectified pilot and rectified negative feedback is applied to the oscillator control electrode to stabilize and linearize the control. The oscillator shown comprises a frequency-determining circuit 2, 4 coupled to the output terminals 9, 8 and to a potentiometer 10 providing the regenerative feedback. Part of the output is fed through a capacitor 16 to a voltage doubler rectifier circuit, the output of which is fed through an R.C. smoothing circuit 24, 25 or a low-pass filter and the rectified pilot input circuit 20, 21 to the control grid where it acts in opposition to the rectified pilot. The capacitor 16 feeding the voltage-doubler rectifier may alternatively be connected to a high impedance inserted between the transformer and the H.T. supply, Fig. 2 (not shown), in which case a low impedance rectifier circuit may be used. Specification 545,866 is referred to.
GB2708649A 1949-10-21 1949-10-21 Improvements in or relating to arrangements for varying the amplitude of generated oscillations Expired GB682189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2708649A GB682189A (en) 1949-10-21 1949-10-21 Improvements in or relating to arrangements for varying the amplitude of generated oscillations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2708649A GB682189A (en) 1949-10-21 1949-10-21 Improvements in or relating to arrangements for varying the amplitude of generated oscillations

Publications (1)

Publication Number Publication Date
GB682189A true GB682189A (en) 1952-11-05

Family

ID=10253958

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2708649A Expired GB682189A (en) 1949-10-21 1949-10-21 Improvements in or relating to arrangements for varying the amplitude of generated oscillations

Country Status (1)

Country Link
GB (1) GB682189A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1018941B (en) * 1954-12-17 1957-11-07 Oskar Vierling Dr Circuit arrangement for stabilizing and regulating the output voltage of a transistor oscillator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1018941B (en) * 1954-12-17 1957-11-07 Oskar Vierling Dr Circuit arrangement for stabilizing and regulating the output voltage of a transistor oscillator

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