GB710473A - Improvements in or relating to electrical amplifying circuits - Google Patents

Improvements in or relating to electrical amplifying circuits

Info

Publication number
GB710473A
GB710473A GB14842/52A GB1484252A GB710473A GB 710473 A GB710473 A GB 710473A GB 14842/52 A GB14842/52 A GB 14842/52A GB 1484252 A GB1484252 A GB 1484252A GB 710473 A GB710473 A GB 710473A
Authority
GB
United Kingdom
Prior art keywords
push
pull
circuit
microphone
pick
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
GB14842/52A
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 GB710473A publication Critical patent/GB710473A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • 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

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

710,473. Sound reproducing circuits. PHILIPS ELECTRICAL INDUSTRIES, Ltd. June 12, 1952 [June 15, 1951], No. 14842/52. Class 40 (4) [Also in Group XL (c)] The output from a gramophone pick-up 17 is suppressed in a push-pull amplifier with automatic gain control whenever pre-amplified signals are received from a microphone 16. As shown, the microphone is connected over pre-amplifying valve 1 to the pick-up circuit at a common amplifying valve 2 which supplies a push-pull pair of valves 6, 7 over phase reversing valves 3, 4. In the push-pull circuit a cathode transformer 20 and a rectifier 21 provides stabilized class B operation. The push-pull output is applied over a transformer 8 to a loudspeaker 9 and to an automatic gain control circuit comprising a rectifier 10 and a smoothing circuit 11, a potentiometer 12 determining the threshold control voltage. In a modification the pick-up may be replaced by a second microphone.
GB14842/52A 1951-06-15 1952-06-12 Improvements in or relating to electrical amplifying circuits Expired GB710473A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE710473X 1951-06-15

Publications (1)

Publication Number Publication Date
GB710473A true GB710473A (en) 1954-06-16

Family

ID=6618830

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14842/52A Expired GB710473A (en) 1951-06-15 1952-06-12 Improvements in or relating to electrical amplifying circuits

Country Status (1)

Country Link
GB (1) GB710473A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860194A (en) * 1953-09-25 1958-11-11 Int Standard Electric Corp Circuit arrangement for the transmission of signals
GB2122452A (en) * 1979-06-21 1984-01-11 Sony Corp Recording and reproducing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860194A (en) * 1953-09-25 1958-11-11 Int Standard Electric Corp Circuit arrangement for the transmission of signals
GB2122452A (en) * 1979-06-21 1984-01-11 Sony Corp Recording and reproducing apparatus

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