GB566551A - Improvements in apparatus for amplifying small electrical currents - Google Patents

Improvements in apparatus for amplifying small electrical currents

Info

Publication number
GB566551A
GB566551A GB1331143A GB1331143A GB566551A GB 566551 A GB566551 A GB 566551A GB 1331143 A GB1331143 A GB 1331143A GB 1331143 A GB1331143 A GB 1331143A GB 566551 A GB566551 A GB 566551A
Authority
GB
United Kingdom
Prior art keywords
thermo
couple
derived
electrical currents
amplifier
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
GB1331143A
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.)
ALLTOOLS Ltd
Original Assignee
ALLTOOLS 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 ALLTOOLS Ltd filed Critical ALLTOOLS Ltd
Priority to GB1331143A priority Critical patent/GB566551A/en
Publication of GB566551A publication Critical patent/GB566551A/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

566,551. Converting. GRAVES, A., DAWES, T. J., and ALLTOOLS, Ltd. Aug. 16, 1943, No. 13311. [Class 38 (ii)] [Also in Group XXXVI] Small direct currents, derived from a source such as a thermo-couple 28, are chopped into pulsating current suitable for amplification by an A.C. amplifier 30 by means of a resistance 26 of the carbon microphone type, the vibrating element of which is driven by a coil 25 energized by A.C. derived from a tuning-fork oscillation generator 10 ... 18, the output of which may be amplified by a thermionic amplifier 19. Zero error at the indicating instrument 31 due to the effects of external temperature changes on the thermo-couple 28 may be corrected by adjustment of a tapping on a resistance network R, R1 associated with the circuit of the thermo-couple.
GB1331143A 1943-08-16 1943-08-16 Improvements in apparatus for amplifying small electrical currents Expired GB566551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1331143A GB566551A (en) 1943-08-16 1943-08-16 Improvements in apparatus for amplifying small electrical currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1331143A GB566551A (en) 1943-08-16 1943-08-16 Improvements in apparatus for amplifying small electrical currents

Publications (1)

Publication Number Publication Date
GB566551A true GB566551A (en) 1945-01-03

Family

ID=10020652

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1331143A Expired GB566551A (en) 1943-08-16 1943-08-16 Improvements in apparatus for amplifying small electrical currents

Country Status (1)

Country Link
GB (1) GB566551A (en)

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