GB1380151A - Protective circuitry for an electroacoustic transducer - Google Patents

Protective circuitry for an electroacoustic transducer

Info

Publication number
GB1380151A
GB1380151A GB1325672A GB1325672A GB1380151A GB 1380151 A GB1380151 A GB 1380151A GB 1325672 A GB1325672 A GB 1325672A GB 1325672 A GB1325672 A GB 1325672A GB 1380151 A GB1380151 A GB 1380151A
Authority
GB
United Kingdom
Prior art keywords
sound reproducer
capacitor
long time
sufficiently long
circuit breaker
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
GB1325672A
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.)
Stanton Magnetics Inc
Original Assignee
Stanton Magnetics Inc
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 Stanton Magnetics Inc filed Critical Stanton Magnetics Inc
Publication of GB1380151A publication Critical patent/GB1380151A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • 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
    • H04R3/007—Protection circuits for transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Protection Of Static Devices (AREA)

Abstract

1380151 Protective arrangements STANTON MAGNETICS Inc 21 March 1972 [16 April 1971] 13256/72 Heading H2K [Also in Division H4] Overload protection for a sound reproducer 14 such as a dynamic or electrostatic loud-speaker or headphone, comprises a circuit-breaker 24, e.g. of electromagnetic type or consisting of a fuse, connected between one output terminal 16 of a driving device 12 and one input terminal 20 of the sound reproducer 14. In operation, the driving signal is sampled via two resistors 28 and 30 forming a voltage divider. The sampled signal is rectified by a diode 44 and stored in a capacitor 34. When the capacitor 34 is charged to a certain point by the sampled signal exceeding a threshold level for a sufficiently long time, or by a signal having a closely spaced series of instantaneous parts sufficient to maintain the charge on capacitor 34 at a required value for a - sufficiently long time, it gates a S.C.R. 36 which then becomes conductive and shorts out the sound reproducer 14. The current through circuit breaker 24 rises sharply and, if S.C.R. 36 remains fired for a sufficiently long time, circuit breaker 24 opens, thereby disconnecting the sound reproducer 14. Resistor 26 represents the resistance of circuit breaker 24.
GB1325672A 1971-04-16 1972-03-21 Protective circuitry for an electroacoustic transducer Expired GB1380151A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13470371A 1971-04-16 1971-04-16

Publications (1)

Publication Number Publication Date
GB1380151A true GB1380151A (en) 1975-01-08

Family

ID=22464585

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1325672A Expired GB1380151A (en) 1971-04-16 1972-03-21 Protective circuitry for an electroacoustic transducer

Country Status (9)

Country Link
US (1) US3686511A (en)
BE (1) BE781432A (en)
CA (1) CA931513A (en)
CH (1) CH551728A (en)
DE (1) DE2217523A1 (en)
FR (1) FR2133639B1 (en)
GB (1) GB1380151A (en)
IT (1) IT957276B (en)
NL (1) NL7204045A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002477A1 (en) * 1979-05-08 1980-11-13 Fortieth Benelux Nominees Pty Protection device or circuit for loudspeakers
GB2120903A (en) * 1982-05-28 1983-12-07 British Broadcasting Corp Headphone level protection circuit

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50117735U (en) * 1974-03-10 1975-09-26
DE2415816C3 (en) * 1974-04-01 1981-10-29 Arndt 7500 Karlsruhe Klingenberg Procedure for limiting the maximum load on electroacoustic transducer systems
JPS5177828A (en) * 1974-12-27 1976-07-06 Matsushita Electric Ind Co Ltd IJOKODENATSUYOKUSEIKAIRO
DE2641079C3 (en) * 1976-09-11 1986-07-31 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover Loudspeaker circuit
US4242713A (en) * 1979-10-25 1980-12-30 Goodrich Edward W Triac output asymmetry detector
US4406921A (en) * 1981-06-15 1983-09-27 Electro Audio Dynamics, Inc. Apparatus for improving linearity of electromechanical transducers
US4410924A (en) * 1981-09-10 1983-10-18 The Gorman-Rupp Company Motor protection control circuit
FI933069A (en) * 1993-07-02 1995-01-03 Nokia Telecommunications Oy Method and apparatus for protecting an electronic circuit
US20080044045A1 (en) * 2006-08-15 2008-02-21 Dobbs-Stanford Corporation Externally fused speaker terminal cup

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215896A (en) * 1962-10-04 1965-11-02 Gen Electric Fast response overload protection circuit
US3317792A (en) * 1964-03-20 1967-05-02 Westinghouse Electric Corp Load protection circuit
GB1110123A (en) * 1965-04-26 1968-04-18 Stone J & Co Ltd Improvements relating to the protection of semi-conductor apparatus
US3549808A (en) * 1967-10-09 1970-12-22 Marantz Co Protective circuit for speaker windings
DE1762472C3 (en) * 1968-06-22 1975-03-06 Grundig, E.M.V.-Elektro-Mechanische Versuchsanstalt-Max Grundig, 8510 Fuerth Overload protection circuit for the transistors of an amplifier provided with an ironless push-pull stage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002477A1 (en) * 1979-05-08 1980-11-13 Fortieth Benelux Nominees Pty Protection device or circuit for loudspeakers
GB2120903A (en) * 1982-05-28 1983-12-07 British Broadcasting Corp Headphone level protection circuit
EP0095902A1 (en) * 1982-05-28 1983-12-07 British Broadcasting Corporation Headphone level protection circuit

Also Published As

Publication number Publication date
CA931513A (en) 1973-08-07
NL7204045A (en) 1972-10-18
FR2133639B1 (en) 1978-05-26
DE2217523A1 (en) 1972-10-26
CH551728A (en) 1974-07-15
FR2133639A1 (en) 1972-12-01
IT957276B (en) 1973-10-10
US3686511A (en) 1972-08-22
BE781432A (en) 1972-09-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee