JPS57143910A - Signal level adjusting device - Google Patents

Signal level adjusting device

Info

Publication number
JPS57143910A
JPS57143910A JP3023581A JP3023581A JPS57143910A JP S57143910 A JPS57143910 A JP S57143910A JP 3023581 A JP3023581 A JP 3023581A JP 3023581 A JP3023581 A JP 3023581A JP S57143910 A JPS57143910 A JP S57143910A
Authority
JP
Japan
Prior art keywords
variable
amplifier
signal level
constitution
input signal
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
JP3023581A
Other languages
Japanese (ja)
Inventor
Masao Noro
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP3023581A priority Critical patent/JPS57143910A/en
Publication of JPS57143910A publication Critical patent/JPS57143910A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To reduce gang errors while eliminating a sliding noise and a thermal noise by adjusting a signal level by dividing the voltage of an input signal through capacitors including a variable capacitor in a volume controller etc. CONSTITUTION:Variable capacitors (C) 1 and 2 are connected in series and applied with an input signal Vin, and a signal at an intermediate point A is obtained through a buffer amplifier 1 having an extremely high bias resistance R1; and either or both of the C1 and C2 are varied to vary the output Vout of the amplifier 1. To make the low cut-off frequency of this circuit constant, an inverting amplifier 2 is used and its output is fed back negatively through the C4 and R2. Further, variable C5 and C6 are connected into multistage constitution to obtain a wide variable range, and this is usable as an audio attenuator.
JP3023581A 1981-03-03 1981-03-03 Signal level adjusting device Pending JPS57143910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3023581A JPS57143910A (en) 1981-03-03 1981-03-03 Signal level adjusting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3023581A JPS57143910A (en) 1981-03-03 1981-03-03 Signal level adjusting device

Publications (1)

Publication Number Publication Date
JPS57143910A true JPS57143910A (en) 1982-09-06

Family

ID=12298048

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3023581A Pending JPS57143910A (en) 1981-03-03 1981-03-03 Signal level adjusting device

Country Status (1)

Country Link
JP (1) JPS57143910A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258590A (en) * 2005-03-17 2006-09-28 Oppama Kogyo Kk Engine tachometer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258590A (en) * 2005-03-17 2006-09-28 Oppama Kogyo Kk Engine tachometer

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