JPS62158922U - - Google Patents
Info
- Publication number
- JPS62158922U JPS62158922U JP4569186U JP4569186U JPS62158922U JP S62158922 U JPS62158922 U JP S62158922U JP 4569186 U JP4569186 U JP 4569186U JP 4569186 U JP4569186 U JP 4569186U JP S62158922 U JPS62158922 U JP S62158922U
- Authority
- JP
- Japan
- Prior art keywords
- output
- outputs
- operational amplifier
- receives
- changeover switch
- 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
Links
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Control Of Amplification And Gain Control (AREA)
Description
第１図は本考案の原理説明図、第２図は既提案
回路図、第３図は本考案の実施例を示す回路図で
ある。
図面でＲ１は第１の可変抵抗、Ｒ２は第２の可
変抵抗、Ｓ１は第１の切換スイツチ、Ｓ２は第２
の切換スイツチ、Ａは演算増幅器である。
FIG. 1 is a diagram illustrating the principle of the present invention, FIG. 2 is a previously proposed circuit diagram, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. In the drawing, R1 is the first variable resistor, R2 is the second variable resistor, S1 is the first changeover switch, and S2 is the second variable resistor.
A is an operational amplifier.
Claims (1)
定まる分割電圧を出力する第１の可変抵抗Ｒ１と
、 コントロール信号に従つて、該第１の可変抵抗
の出力又はグランド電位を出力する第１の切換ス
イツチＳ１と、 該第１の切換スイツチの出力を＋入力端子に受
ける演算増幅器と、 該演算増幅器の出力を受け、デジタル信号によ
り定まる分割電圧を出力する第２の可変抵抗Ｒ２
と、 コントロール信号に従つて、該第２の可変抵抗
の出力又はグランド電位を出力し、これを演算増
幅器Ａの−入力端子に加える第２の切換スイツチ
Ｓ２とを備えることを特徴とする電子ボリウム装
置。[Claims for Utility Model Registration] A first variable resistor R1 that receives an analog input signal and outputs a divided voltage determined by a digital signal; and a control signal that controls the output or ground potential of the first variable resistor. A first changeover switch S1 that outputs an output, an operational amplifier that receives the output of the first changeover switch at its + input terminal, and a second variable that receives the output of the operational amplifier and outputs a divided voltage determined by a digital signal. Resistance R2
and a second changeover switch S2 that outputs the output of the second variable resistor or the ground potential according to the control signal and applies it to the - input terminal of the operational amplifier A. Volume device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986045691U JPH0450646Y2 (en) | 1986-03-28 | 1986-03-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986045691U JPH0450646Y2 (en) | 1986-03-28 | 1986-03-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62158922U true JPS62158922U (en) | 1987-10-08 |
| JPH0450646Y2 JPH0450646Y2 (en) | 1992-11-30 |
Family
ID=30864657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986045691U Expired JPH0450646Y2 (en) | 1986-03-28 | 1986-03-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0450646Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50159653A (en) * | 1974-06-12 | 1975-12-24 | ||
| JPS56164609A (en) * | 1980-05-21 | 1981-12-17 | Nec Corp | Gain adjusting circuit |
| JPS57210708A (en) * | 1981-06-22 | 1982-12-24 | Hitachi Ltd | Variable gain amplifier |
-
1986
- 1986-03-28 JP JP1986045691U patent/JPH0450646Y2/ja not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50159653A (en) * | 1974-06-12 | 1975-12-24 | ||
| JPS56164609A (en) * | 1980-05-21 | 1981-12-17 | Nec Corp | Gain adjusting circuit |
| JPS57210708A (en) * | 1981-06-22 | 1982-12-24 | Hitachi Ltd | Variable gain amplifier |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0450646Y2 (en) | 1992-11-30 |
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