GB536292A - Improvements in direct current amplifiers - Google Patents

Improvements in direct current amplifiers

Info

Publication number
GB536292A
GB536292A GB27397/39A GB2739739A GB536292A GB 536292 A GB536292 A GB 536292A GB 27397/39 A GB27397/39 A GB 27397/39A GB 2739739 A GB2739739 A GB 2739739A GB 536292 A GB536292 A GB 536292A
Authority
GB
United Kingdom
Prior art keywords
valves
potential
direct current
anodes
grids
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
GB27397/39A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB536292A publication Critical patent/GB536292A/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
    • H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
    • H03F3/40—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with tubes only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

536,292. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 6, 1939, No. 27397. Convention date, Oct. 7, 1938. [Class 40 (v) ] A slowly varying direct current from a photocell 11, used for example in fascimile transmission, is amplified by modulation in valves 30, 31 upon a chopper frequency from source 23, and thereafter amplified in valves 42, 43. The potential developed across resistor 21 is applied through resistors 34, 35 to the anodes of the valves 30, 31 and the grids of the valves 42, 43. As the valves 30, 31 conduct alternatively under control of the chopper frequency, the anodes are reduced to zero potential and thus the grids of the valves 42, 43 are energised with a square topped wave, the amplitude of which is proportional to potential across resistor 21. In Fig. 2 (not shown) the push-pull valves are replaced by single valves, and the output from the amplifier is rectified and developed across a cathode resistance.
GB27397/39A 1938-10-07 1939-10-06 Improvements in direct current amplifiers Expired GB536292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US233701A US2323966A (en) 1938-10-07 1938-10-07 Amplifier

Publications (1)

Publication Number Publication Date
GB536292A true GB536292A (en) 1941-05-09

Family

ID=22878352

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27397/39A Expired GB536292A (en) 1938-10-07 1939-10-06 Improvements in direct current amplifiers

Country Status (2)

Country Link
US (1) US2323966A (en)
GB (1) GB536292A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2933691A (en) * 1957-12-17 1960-04-19 Bell & Howell Co Modulator

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651746A (en) * 1945-08-17 1953-09-08 Kearney & Trecker Corp Control device
US2802106A (en) * 1945-11-14 1957-08-06 Robert M Page Signal converter system
US2456420A (en) * 1946-08-31 1948-12-14 Gen Electric Electronic direct-current control system
US2620441A (en) * 1946-10-24 1952-12-02 Sperry Corp Electronic signal mixer
US2574690A (en) * 1947-03-12 1951-11-13 Rca Corp Amplifier-rectifier circuit
US2510742A (en) * 1948-03-03 1950-06-06 Arthur Nosworthy T Electronic control
US2682624A (en) * 1952-12-19 1954-06-29 Tung Sol Electric Inc Light-sensitive circuit
US2846522A (en) * 1953-02-18 1958-08-05 Sun Oil Co Differential amplifier circuits
US2922051A (en) * 1954-04-05 1960-01-19 Westinghouse Electric Corp Low voltage inverting device
US2918583A (en) * 1955-05-04 1959-12-22 W M Welch Mfg Company Apparatus for measuring radiant energy at very low levels
US2876725A (en) * 1956-09-06 1959-03-10 Du Pont Solder-free cemented body-seamed sheet metal container and method of fabricating the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2933691A (en) * 1957-12-17 1960-04-19 Bell & Howell Co Modulator

Also Published As

Publication number Publication date
US2323966A (en) 1943-07-13

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