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GB949748A - Improvements in or relating to transistor amplifier devices equipped with an ear phone and a loudspeaker - Google Patents

Improvements in or relating to transistor amplifier devices equipped with an ear phone and a loudspeaker

Info

Publication number
GB949748A
GB949748A GB35490/62A GB3549062A GB949748A GB 949748 A GB949748 A GB 949748A GB 35490/62 A GB35490/62 A GB 35490/62A GB 3549062 A GB3549062 A GB 3549062A GB 949748 A GB949748 A GB 949748A
Authority
GB
United Kingdom
Prior art keywords
loud
speaker
transistors
earphone
plug
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
GB35490/62A
Other languages
English (en)
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 Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB949748A publication Critical patent/GB949748A/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
    • 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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0244—Stepped control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
GB35490/62A 1961-09-21 1962-09-18 Improvements in or relating to transistor amplifier devices equipped with an ear phone and a loudspeaker Expired GB949748A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR873856A FR1308034A (fr) 1961-09-21 1961-09-21 Radio-récepteur à transistors et à écouteurs
FR907045A FR82171E (fr) 1961-09-21 1962-08-16 Radio-récepteur à transistors et à écouteurs

Publications (1)

Publication Number Publication Date
GB949748A true GB949748A (en) 1964-02-19

Family

ID=26192391

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35490/62A Expired GB949748A (en) 1961-09-21 1962-09-18 Improvements in or relating to transistor amplifier devices equipped with an ear phone and a loudspeaker

Country Status (6)

Country Link
BE (1) BE622641A (xx)
CH (1) CH396101A (xx)
DE (1) DE1158118B (xx)
FR (2) FR1308034A (xx)
GB (1) GB949748A (xx)
OA (2) OA048E (xx)

Also Published As

Publication number Publication date
OA01044A (fr) 1968-08-07
DE1158118B (de) 1963-11-28
FR82171E (fr) 1964-01-04
FR1308034A (fr) 1962-11-03
OA048E (xx) 1968-08-07
CH396101A (de) 1965-07-31
BE622641A (xx)

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