GB618789A - Improvements in or relating to electronic amplifying circuits - Google Patents

Improvements in or relating to electronic amplifying circuits

Info

Publication number
GB618789A
GB618789A GB24120/46A GB2412046A GB618789A GB 618789 A GB618789 A GB 618789A GB 24120/46 A GB24120/46 A GB 24120/46A GB 2412046 A GB2412046 A GB 2412046A GB 618789 A GB618789 A GB 618789A
Authority
GB
United Kingdom
Prior art keywords
valve
loud
aug
resistance
feedback circuit
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
GB24120/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB618789A publication Critical patent/GB618789A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/02—Manually-operated control
    • H03G5/04—Manually-operated control in untuned amplifiers
    • H03G5/06—Manually-operated control in untuned amplifiers having discharge tubes
    • H03G5/08—Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/22—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H04R3/14—Cross-over networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments

Abstract

618,789. Loud-speaker circuits. PHILIPS LAMPS, Ltd. Aug. 14, 1946, No. 24120. Convention date, Aug. 3, 1945. [Class 40 (iv)] A system comprising loud speakers L<SP>1</SP>, L2 responsive to high- and low-frequencies respectively and arranged to present a flat impedance characteristic to the output of the valve 1 is provided with means for distorting the input to the valve to compensate for differing efficiencies of the loud-speakers. Thus, if L<SP>1</SP> is less efficient than L<SP>2</SP>, the required distortion may be achieved by means of a resistance and inductance connected in series across the grid and cathode of the valve, or as shown, Fig. 5, by means of a negative feedback circuit comprising a resistance R<SP>1</SP> and a condenser C<SP>1</SP> in parallel. If L<SP>1</SP> is more efficient than L<SP>2</SP>, the inductance is replaced by a capacity and vice versa in the above-mentioned circuits. A negative feedback circuit according to the invention for a push-pull arrangement is also given, Fig. 6 (not shown).
GB24120/46A 1945-08-03 1946-08-14 Improvements in or relating to electronic amplifying circuits Expired GB618789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL254963X 1945-08-03

Publications (1)

Publication Number Publication Date
GB618789A true GB618789A (en) 1949-02-28

Family

ID=19781259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24120/46A Expired GB618789A (en) 1945-08-03 1946-08-14 Improvements in or relating to electronic amplifying circuits

Country Status (5)

Country Link
US (1) US2452499A (en)
BE (1) BE467997A (en)
CH (1) CH254963A (en)
FR (1) FR936806A (en)
GB (1) GB618789A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1012643B (en) * 1955-05-23 1957-07-25 Loewe Opta Ag Low frequency amplifier arrangement with several loudspeakers or loudspeaker groups
US3067390A (en) * 1959-10-07 1962-12-04 Optimation Inc Low level frequency dividing network
GB1028383A (en) * 1963-10-29 1966-05-04 Rank Bush Murphy Ltd Amplifier for feeding a reactive load
USRE31228E (en) * 1967-12-04 1983-05-03 Bose Corporation Loudspeaker system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB215104A (en) * 1923-02-05 1924-05-05 Henry Joseph Round Improved means for reproducing sound
US1711529A (en) * 1923-05-14 1929-05-07 Signal Ges Mit Beschraenkter H Multiple-range sound-transmitting system
FR613417A (en) * 1925-03-31 1926-11-17
US1698269A (en) * 1926-10-29 1929-01-08 Konheim Harvey Method of reproducing electrical oscillations and apparatus therefor
US1760821A (en) * 1927-10-19 1930-05-27 Leon F Douglass Amplifying and reproducing system

Also Published As

Publication number Publication date
BE467997A (en)
FR936806A (en) 1948-07-30
US2452499A (en) 1948-10-26
CH254963A (en) 1948-05-31

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