JPS6490605A - Agc circuit - Google Patents

Agc circuit

Info

Publication number
JPS6490605A
JPS6490605A JP62249013A JP24901387A JPS6490605A JP S6490605 A JPS6490605 A JP S6490605A JP 62249013 A JP62249013 A JP 62249013A JP 24901387 A JP24901387 A JP 24901387A JP S6490605 A JPS6490605 A JP S6490605A
Authority
JP
Japan
Prior art keywords
input
output
circuit
resistor
operational amplifier
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
JP62249013A
Other languages
Japanese (ja)
Other versions
JP2585630B2 (en
Inventor
Noriyuki Jitosho
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62249013A priority Critical patent/JP2585630B2/en
Publication of JPS6490605A publication Critical patent/JPS6490605A/en
Application granted granted Critical
Publication of JP2585630B2 publication Critical patent/JP2585630B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To facilitate maintenance with low cost by employing no operational amplifier for the input and output of an AGC circuit and coupling them by a capacitor and a resistor so as to eliminate the time delay of the input and output thereby reducing number of components and simplifying the circuit. CONSTITUTION:An output voltage detected by a peak hold circuit 15 is connected to a noninverting input of an operational amplifier IC 5 and a reference voltage set optionally is inputted to an inverting input. A resistor R24 is provided, which is connected in parallel with a capacitor C8 and in series with a CdS element R30 in a photocoupler PTC1 including a light emitting diode controlled by an output current of a voltage current conversion circuit 18 receiving the output as the input. The connecting point between the CdS element and the resistor R24 is connected to the input of the circuit 15 and used as an output B and the other terminal of the resistor R24 is used as the input A. Thus, the AGC circuit not employing the operational amplifier is obtained for the input and output parts.
JP62249013A 1987-09-30 1987-09-30 AGC circuit Expired - Lifetime JP2585630B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62249013A JP2585630B2 (en) 1987-09-30 1987-09-30 AGC circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62249013A JP2585630B2 (en) 1987-09-30 1987-09-30 AGC circuit

Publications (2)

Publication Number Publication Date
JPS6490605A true JPS6490605A (en) 1989-04-07
JP2585630B2 JP2585630B2 (en) 1997-02-26

Family

ID=17186707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62249013A Expired - Lifetime JP2585630B2 (en) 1987-09-30 1987-09-30 AGC circuit

Country Status (1)

Country Link
JP (1) JP2585630B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030075709A (en) * 2002-03-20 2003-09-26 현대모비스 주식회사 A vehicle's air-vent which can be disassembled easily
KR100423330B1 (en) * 2001-12-13 2004-03-18 현대자동차주식회사 a preventing structure of whistle noise by vent door of air duct in vehicles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161319U (en) * 1982-04-23 1983-10-27 株式会社東芝 AGC amplifier circuit
JPS61198907A (en) * 1985-02-28 1986-09-03 Ricoh Co Ltd Automatic gain controller

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161319U (en) * 1982-04-23 1983-10-27 株式会社東芝 AGC amplifier circuit
JPS61198907A (en) * 1985-02-28 1986-09-03 Ricoh Co Ltd Automatic gain controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100423330B1 (en) * 2001-12-13 2004-03-18 현대자동차주식회사 a preventing structure of whistle noise by vent door of air duct in vehicles
KR20030075709A (en) * 2002-03-20 2003-09-26 현대모비스 주식회사 A vehicle's air-vent which can be disassembled easily

Also Published As

Publication number Publication date
JP2585630B2 (en) 1997-02-26

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