JPS55109009A - Level control circuit - Google Patents

Level control circuit

Info

Publication number
JPS55109009A
JPS55109009A JP1567779A JP1567779A JPS55109009A JP S55109009 A JPS55109009 A JP S55109009A JP 1567779 A JP1567779 A JP 1567779A JP 1567779 A JP1567779 A JP 1567779A JP S55109009 A JPS55109009 A JP S55109009A
Authority
JP
Japan
Prior art keywords
level control
amplifier
current
resistance
att2
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
JP1567779A
Other languages
Japanese (ja)
Other versions
JPS6161286B2 (en
Inventor
Yamato Okashin
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP1567779A priority Critical patent/JPS55109009A/en
Publication of JPS55109009A publication Critical patent/JPS55109009A/en
Publication of JPS6161286B2 publication Critical patent/JPS6161286B2/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 without distortion of the input signal
    • H03G3/02—Manually-operated control

Abstract

PURPOSE:To obtain a level control circuit which features a wide control range with no increment of the signal distortion by forming part of plural number of level control circuits connected vertically into the delay type. CONSTITUTION:The input signal sent through terminal T1 is applied to amplifier 4 via attenuator (ATT) 1 comprising transistors TrQ1 and Q2, resistance R2, ATT2 comprising TrQ3 and Q4 plus pre-amplifier 3 comprising TrQ11-Q18. And diode-connected TrQ23 and variable resistance R23 for level control are connected to the current Miller circuit consisting of TrQ21 and Q22. With variation of the value of resistance 23, current I27 of the current Miller circuit consisting of TrQ26 and Q27 varies, and accordingly collector current I28 and I29 of TrQ28 and Q29 vary each. The amount of attenuation is controlled for ATT1 and 2 by I27 and I29, and current I29 controls the amplification factor of amplifier 3. The level control of ATT2 and amplifier 3 feature the delay type with the proper setting of resistances R22 and R25, thus securing the special characteristics as a whole.
JP1567779A 1979-02-14 1979-02-14 Level control circuit Granted JPS55109009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1567779A JPS55109009A (en) 1979-02-14 1979-02-14 Level control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1567779A JPS55109009A (en) 1979-02-14 1979-02-14 Level control circuit

Publications (2)

Publication Number Publication Date
JPS55109009A true JPS55109009A (en) 1980-08-21
JPS6161286B2 JPS6161286B2 (en) 1986-12-25

Family

ID=11895371

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1567779A Granted JPS55109009A (en) 1979-02-14 1979-02-14 Level control circuit

Country Status (1)

Country Link
JP (1) JPS55109009A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59108414A (en) * 1982-12-14 1984-06-22 Rohm Co Ltd Automatic level adjusting circuit
US6317502B1 (en) * 1996-02-29 2001-11-13 Sanyo Electric Co., Ltd. Electronic volume control circuit with controlled output characteristic

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59108414A (en) * 1982-12-14 1984-06-22 Rohm Co Ltd Automatic level adjusting circuit
JPH0235489B2 (en) * 1982-12-14 1990-08-10 Rohm Kk
US6317502B1 (en) * 1996-02-29 2001-11-13 Sanyo Electric Co., Ltd. Electronic volume control circuit with controlled output characteristic

Also Published As

Publication number Publication date
JPS6161286B2 (en) 1986-12-25

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