JPS57201309A - Voice amplifying circuit - Google Patents

Voice amplifying circuit

Info

Publication number
JPS57201309A
JPS57201309A JP56086193A JP8619381A JPS57201309A JP S57201309 A JPS57201309 A JP S57201309A JP 56086193 A JP56086193 A JP 56086193A JP 8619381 A JP8619381 A JP 8619381A JP S57201309 A JPS57201309 A JP S57201309A
Authority
JP
Japan
Prior art keywords
output circuit
electric current
transistor
circuit
bias
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.)
Pending
Application number
JP56086193A
Other languages
Japanese (ja)
Inventor
Akihiko Hanai
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 JP56086193A priority Critical patent/JPS57201309A/en
Publication of JPS57201309A publication Critical patent/JPS57201309A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To stop the operation of the output circuit of a titled voice amplifying circuit, by breaking the supply of the driving electric current to the output circuit without inserting any power supply switch to be connected to the output circuit.
CONSTITUTION: Under the normal condition, an outside controlling terminal 100 is under floating condition, and an output circuit 50 receives a bias electric current from a bias circuit 30 and amplifies input signals. When the outside controlling terminal 100 is set to a voltage which is lower than the threshold voltage between the base and emitter of a transistor 35, the transistor 35 is cut off and does not supply any electric current to a diode 34 and a transistor 36. That is to say, no bias electric current is supplied to the output circuit 50 and output transistors 51, 54, and 55 are cut off, and, therefore, no voice amplification is performed.
COPYRIGHT: (C)1982,JPO&Japio
JP56086193A 1981-06-04 1981-06-04 Voice amplifying circuit Pending JPS57201309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56086193A JPS57201309A (en) 1981-06-04 1981-06-04 Voice amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56086193A JPS57201309A (en) 1981-06-04 1981-06-04 Voice amplifying circuit

Publications (1)

Publication Number Publication Date
JPS57201309A true JPS57201309A (en) 1982-12-09

Family

ID=13879935

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56086193A Pending JPS57201309A (en) 1981-06-04 1981-06-04 Voice amplifying circuit

Country Status (1)

Country Link
JP (1) JPS57201309A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55156405A (en) * 1979-05-25 1980-12-05 Hitachi Ltd Acoustic amplifying output circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55156405A (en) * 1979-05-25 1980-12-05 Hitachi Ltd Acoustic amplifying output circuit

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