GB473512A - Improvements relating to electric amplifiers - Google Patents

Improvements relating to electric amplifiers

Info

Publication number
GB473512A
GB473512A GB30961/36A GB3096136A GB473512A GB 473512 A GB473512 A GB 473512A GB 30961/36 A GB30961/36 A GB 30961/36A GB 3096136 A GB3096136 A GB 3096136A GB 473512 A GB473512 A GB 473512A
Authority
GB
United Kingdom
Prior art keywords
coil
impedance
carries
amplifier
coils
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
GB30961/36A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB473512A publication Critical patent/GB473512A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/02—Volume compression or expansion in amplifiers having discharge tubes

Landscapes

  • Amplifiers (AREA)

Abstract

473,512. Automatic volume control. NUMANS, J. J. Nov. 12, 1936, No. 30961. Convention date, Nov. 13, 1935. [Class 40 (iv)] [Also in Group XL] The gain of an amplifier is controlled by varying the magnetization of an iron-cored coupling impedance. In one embodiment, for automatic control, a potential divider feeding an amplifier 1 comprises a fixed impedance 7 and a variable impedance 8 which comprises two coils W1, W2 on an iron core which also carries auxiliary coils G1, G2. The coil G1 carries a direct current derived from the amplifier output through transformer 9, rectifier 10 and filter 11, 12, 13, while the coil G2 carries a manually variable current from a D.C. source 14. Volume expansion or contraction may be produced by causing the coil G1 to oppose or assist the coil G2, and the invention is applicable to carrier or audio frequency amplifiers. The impedance of the coil 7 may also be regulated and, if desired, the ranges of regulation of the coils 7, 8 may be different. In a modification, Fig. 2 (not shown), the potential divider is in the output and the rectifier in the input circuit.
GB30961/36A 1935-11-13 1936-11-12 Improvements relating to electric amplifiers Expired GB473512A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL473512X 1935-11-13

Publications (1)

Publication Number Publication Date
GB473512A true GB473512A (en) 1937-10-14

Family

ID=19786496

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30961/36A Expired GB473512A (en) 1935-11-13 1936-11-12 Improvements relating to electric amplifiers

Country Status (1)

Country Link
GB (1) GB473512A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615977A (en) * 1948-05-28 1952-10-28 Rca Corp Gain control circuit utilizing keyed magnetic amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615977A (en) * 1948-05-28 1952-10-28 Rca Corp Gain control circuit utilizing keyed magnetic amplifier

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