JPS62135220U - - Google Patents
Info
- Publication number
- JPS62135220U JPS62135220U JP2355286U JP2355286U JPS62135220U JP S62135220 U JPS62135220 U JP S62135220U JP 2355286 U JP2355286 U JP 2355286U JP 2355286 U JP2355286 U JP 2355286U JP S62135220 U JPS62135220 U JP S62135220U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- output signal
- conversion circuit
- level
- current
- 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
Links
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Control Of Amplification And Gain Control (AREA)
Description
第１図は、本考案の一実施例を示す回路図、及
び第２図は従来のＡＬＣ回路を示す回路図である
。
４……比較回路、８……平滑コンデンサ、１３
……変換トランジスタ、１４……電流ミラー回路
、１７……ＡＬＣトランジスタ。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional ALC circuit. 4 ... Comparison circuit, 8... Smoothing capacitor, 13
...conversion transistor, 14 ...current mirror circuit, 17 ...ALC transistor.
Claims (1)
器の入力信号の減衰を行つて前記出力信号のレベ
ルを一定に保つ自動レベル制御回路において、前
記出力信号のレベルと基準電圧とを比較する比較
回路と、該比較回路の出力信号を平滑するコンデ
ンサと、該コンデンサの端子電圧に応じた定電流
を高インピーダンスで出力電圧―電流変換回路と
、該電圧―電流変換回路の出力電流に応じて前記
増幅器の入力信号を減衰する制御トランジスタと
を備えることを特徴とする自動レベル制御回路。 In an automatic level control circuit that detects the level of an output signal of an amplifier and attenuates the input signal of the amplifier to keep the level of the output signal constant, a comparison circuit that compares the level of the output signal with a reference voltage; , a capacitor for smoothing the output signal of the comparison circuit, a voltage-current conversion circuit that outputs a constant current at high impedance according to the terminal voltage of the capacitor, and a voltage-current conversion circuit that outputs a constant current according to the terminal voltage of the capacitor, and a voltage-current conversion circuit that converts the output signal of the amplifier according to the output current of the voltage-current conversion circuit. and a control transistor that attenuates an input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2355286U JPS62135220U (en) | 1986-02-20 | 1986-02-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2355286U JPS62135220U (en) | 1986-02-20 | 1986-02-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62135220U true JPS62135220U (en) | 1987-08-26 |
Family
ID=30821959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2355286U Pending JPS62135220U (en) | 1986-02-20 | 1986-02-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62135220U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08265074A (en) * | 1995-03-27 | 1996-10-11 | Yamaha Corp | Automatic gain control circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58178615A (en) * | 1982-04-13 | 1983-10-19 | Matsushita Electric Ind Co Ltd | Recording amplifier circuit provided with alc |
-
1986
- 1986-02-20 JP JP2355286U patent/JPS62135220U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58178615A (en) * | 1982-04-13 | 1983-10-19 | Matsushita Electric Ind Co Ltd | Recording amplifier circuit provided with alc |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08265074A (en) * | 1995-03-27 | 1996-10-11 | Yamaha Corp | Automatic gain control circuit |