GB579407A - Improved electric amplifier - Google Patents

Improved electric amplifier

Info

Publication number
GB579407A
GB579407A GB768144A GB768144A GB579407A GB 579407 A GB579407 A GB 579407A GB 768144 A GB768144 A GB 768144A GB 768144 A GB768144 A GB 768144A GB 579407 A GB579407 A GB 579407A
Authority
GB
United Kingdom
Prior art keywords
amplifier
circuit
stage
audio frequency
anode
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
GB768144A
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.)
B P L INSTR Ltd
Original Assignee
B P L INSTR 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 B P L INSTR Ltd filed Critical B P L INSTR Ltd
Priority to GB768144A priority Critical patent/GB579407A/en
Publication of GB579407A publication Critical patent/GB579407A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

579,407. Valve amplifying circuits. B.P.L. (INSTRUMENTS), Ltd., and DIGBY, B. April 25, 1944, No. 7681. Drawings to Specification. [Class 40 (v)] In a circuit for amplifying a specific audio frequency, e.g. for use in an audio frequency bridge or in voice frequency telegraph circuits, positive feed back is used to increase the selectivity. An amplifier is described having two resistance capacity coupled tuned-anode stages, the first of which incorporates a pentode, feed back being taken from the anode of the second stage to the suppressor grid of the first stage, through a blocking condenser and a suitable potentiometer. The screen grid prevents undesirable interaction between the input circuit and the feed-back circuit. The arrangement may be adjusted to be just below the state of self-oscillation. This type of amplifier, it is stated, can also be used for high frequencies.
GB768144A 1944-04-25 1944-04-25 Improved electric amplifier Expired GB579407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB768144A GB579407A (en) 1944-04-25 1944-04-25 Improved electric amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB768144A GB579407A (en) 1944-04-25 1944-04-25 Improved electric amplifier

Publications (1)

Publication Number Publication Date
GB579407A true GB579407A (en) 1946-08-01

Family

ID=9837749

Family Applications (1)

Application Number Title Priority Date Filing Date
GB768144A Expired GB579407A (en) 1944-04-25 1944-04-25 Improved electric amplifier

Country Status (1)

Country Link
GB (1) GB579407A (en)

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