JPS6085607A - Amplifier circuit - Google Patents

Amplifier circuit

Info

Publication number
JPS6085607A
JPS6085607A JP58192381A JP19238183A JPS6085607A JP S6085607 A JPS6085607 A JP S6085607A JP 58192381 A JP58192381 A JP 58192381A JP 19238183 A JP19238183 A JP 19238183A JP S6085607 A JPS6085607 A JP S6085607A
Authority
JP
Japan
Prior art keywords
trq
resistor
capacitor
pop noise
circuit
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
JP58192381A
Other languages
Japanese (ja)
Inventor
Kazuo Watanabe
Tetsuo Sato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP58192381A priority Critical patent/JPS6085607A/en
Publication of JPS6085607A publication Critical patent/JPS6085607A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent generation of pop noise by controlling an output transistor (TR) into an inoperating state at a prescribed time after application of power is detected so as to interrupt a current path to a load.
CONSTITUTION: A circuit block 4 indicates a pop noise preventing circuit, and when a +Vcc power is applied, a charging current flows to a capacitor C2 and a resistor R4, a voltage drop is generated across the resistor R4, a bias voltage is applied to TRs QA, QB and both are brought into the on-state. No bias voltage is fed to a TRQ6 constituting a voltage-current converting circuit 5 in this case so that the TRQ6 is turned off. Thus, a power TRQ8 constituting a drive circuit 6 is turned off and no drive current flows to an output capacitor C3 and a headphone 11. Thus, no pop noise is generated at application of +Vcc power supply. The TRs QA, QB are inoperative at all after a time decided by a time constant comprising the capacitor C2 and the resistor R4 and normal amplifier operation is performed.
COPYRIGHT: (C)1985,JPO&Japio
JP58192381A 1983-10-17 1983-10-17 Amplifier circuit Pending JPS6085607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58192381A JPS6085607A (en) 1983-10-17 1983-10-17 Amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58192381A JPS6085607A (en) 1983-10-17 1983-10-17 Amplifier circuit

Publications (1)

Publication Number Publication Date
JPS6085607A true JPS6085607A (en) 1985-05-15

Family

ID=16290346

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58192381A Pending JPS6085607A (en) 1983-10-17 1983-10-17 Amplifier circuit

Country Status (1)

Country Link
JP (1) JPS6085607A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5327100A (en) * 1993-03-01 1994-07-05 Motorola, Inc. Negative slew rate enhancement circuit for an operational amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5327100A (en) * 1993-03-01 1994-07-05 Motorola, Inc. Negative slew rate enhancement circuit for an operational amplifier

Similar Documents

Publication Publication Date Title
JPS60124124A (en) Input circuit
JPS5292321A (en) Power supply circuit
JPS5955608A (en) Amplifier
JPS6085607A (en) Amplifier circuit
JPH0421391A (en) Forward/reverse rotating apparatus for reluctance type motor
JPS5622117A (en) Electric power supply system for cmos memory circuit
JPH04274504A (en) Power supply voltage dropping circuit
JPS60123111A (en) Amplifiying circuit
JPS56123111A (en) Muting circuit
JPH0218783A (en) Semiconductor storage device
JPH0210917A (en) Threshold voltage generating circuit for mos transistor
JPH0245813A (en) Integrated power source circuit
JPS63245106A (en) Btl power amplifier
JPH0449712A (en) Driving circuit
JPH0287930A (en) Protective circuit for stabilized power source
JPS60143008A (en) Low frequency amplifier
JPS54136619A (en) Dc voltage stabilized power unit
JPH04286009A (en) Power supply circuit
JPS60143007A (en) Low frequency amplifier
JPS59138105A (en) Muting circuit
JPS6085608A (en) Amplifier circuit
JPS61249126A (en) Circuit for detecting fall of supply voltage
JPH04153997A (en) Semiconductor integrated circuit device
JPH0248809A (en) Power amplifier
JPH0273705A (en) Oscillation circuit