JPS56156007A - Amplifying device - Google Patents

Amplifying device

Info

Publication number
JPS56156007A
JPS56156007A JP5975480A JP5975480A JPS56156007A JP S56156007 A JPS56156007 A JP S56156007A JP 5975480 A JP5975480 A JP 5975480A JP 5975480 A JP5975480 A JP 5975480A JP S56156007 A JPS56156007 A JP S56156007A
Authority
JP
Japan
Prior art keywords
reproduction
capacitor
switches
over
gain control
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.)
Granted
Application number
JP5975480A
Other languages
Japanese (ja)
Other versions
JPS6258568B2 (en
Inventor
Koichi Tanaka
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP5975480A priority Critical patent/JPS56156007A/en
Publication of JPS56156007A publication Critical patent/JPS56156007A/en
Publication of JPS6258568B2 publication Critical patent/JPS6258568B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To prevent a malfunction during a switch between the sound recording and reproduction, by discharging the electric charge of a capacitor in a time constant circuit connected to the base of a transistor that decides the gain of an automatic gain control circuit when no automatic gain control is required. CONSTITUTION:A change-over is carried out by the switches 3, 7, 10 and 13 between the reproduction amplifying system comprising the amplifiers 2 and 11 and the record amplifying system comprising the amplifiers 6 and 14. These switches are actuated by a change-over circuit 8. A transistor Q3 is turned on during a reproduction, i.e., when only the switches 3 and 10 are turned on with no use required for an automatic gain control circuit 16, and thus discharges the electric charge of a capacitor C9. Accordingly the voltage of capacitor C9 in a time constant circuit has no rise regardless of a consecutive change-over between the recording and reproduction. As a result, an output can be produced instantaneously.
JP5975480A 1980-05-06 1980-05-06 Amplifying device Granted JPS56156007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5975480A JPS56156007A (en) 1980-05-06 1980-05-06 Amplifying device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5975480A JPS56156007A (en) 1980-05-06 1980-05-06 Amplifying device

Publications (2)

Publication Number Publication Date
JPS56156007A true JPS56156007A (en) 1981-12-02
JPS6258568B2 JPS6258568B2 (en) 1987-12-07

Family

ID=13122350

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5975480A Granted JPS56156007A (en) 1980-05-06 1980-05-06 Amplifying device

Country Status (1)

Country Link
JP (1) JPS56156007A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6459176A (en) * 1987-08-31 1989-03-06 Seiko Epson Corp Power source circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120721U (en) * 1975-03-27 1976-09-30
JPS52154213U (en) * 1976-05-17 1977-11-22
JPS53136811A (en) * 1977-05-02 1978-11-29 Omron Tateisi Electronics Co Magnetic card rerecorder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120721U (en) * 1975-03-27 1976-09-30
JPS52154213U (en) * 1976-05-17 1977-11-22
JPS53136811A (en) * 1977-05-02 1978-11-29 Omron Tateisi Electronics Co Magnetic card rerecorder

Also Published As

Publication number Publication date
JPS6258568B2 (en) 1987-12-07

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