JPH0370412U - - Google Patents
Info
- Publication number
- JPH0370412U JPH0370412U JP13180089U JP13180089U JPH0370412U JP H0370412 U JPH0370412 U JP H0370412U JP 13180089 U JP13180089 U JP 13180089U JP 13180089 U JP13180089 U JP 13180089U JP H0370412 U JPH0370412 U JP H0370412U
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- differential amplifier
- current source
- operating current
- operating
- 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
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
Description
図面は本考案回路を示す回路図である。
１７……電源スイツチ、１８……電源、１９，
２４……コンデンサ、２０，２３……トランジス
タ。
The drawing is a circuit diagram showing the circuit of the present invention. 17...Power switch, 18...Power supply, 19,
24... Capacitor, 20, 23... Transistor.
Claims (1)
を有し、前記増幅器と前記差動増幅器との電源が
共通とされた増幅回路において、 電源をオンオフするための電源スイツチのオン
に基づいて前記差動増幅器の動作電流源を動作可
能な状態とし、且つ、前記電源スイツチのオフに
基づいて前記動作電流源を非動作状態とすべく、
前記動作電流源に接続されたスイツチング回路と
、 前記電源スイツチのオン時、前記スイツチング
回路の動作に基づいて前記動作電流源を第１の所
定時間遅延させて動作状態とすべく、前記動作電
流源に接続された第１の遅延回路と、 前記電源スイツチのオフ時、前記スイツチング
回路の動作に基づいて前記動作電流源を第２の所
定時間遅延させて非動作状態とすべく、前記電源
に接続された第２の遅延回路と、を備え、 前記電源スイツチをオン時、前記増幅器を安定
動作させた後に前記差動増幅器を動作させ、前記
電源スイツチのオフ時、前記差動増幅器の動作を
停止させた後に前記増幅器の動作を停止させ、前
記差動増幅器の出力からポツプ音が発生するのを
防止したことを特徴とするポツプ音防止回路。 (2) 前記第１の所定時間は、前記増幅器を安定
動作させた後に前記差動増幅器を動作させるのに
要する時間であり、前記第２の所定時間は、前記
増幅器の動作を停止させる以前に前記差動増幅器
の動作を停止させるのに要する時間であることを
特徴とする請求項(1)記載のポツプ音防止回路。 (3) 前記第１及び第２の遅延回路は、コンデン
サであることを特徴とする請求項(1)記載のポツ
プ音防止回路。[Claims for Utility Model Registration] (1) In an amplifier circuit that includes an amplifier and a differential amplifier following the amplifier, and in which a common power source is used for the amplifier and the differential amplifier, the power source is turned on and off. to make the operating current source of the differential amplifier operational based on the on-state of the power switch, and to make the operating current source inactive based on the off-state of the power switch;
a switching circuit connected to the operating current source; the operating current source configured to delay the operating current source for a first predetermined period of time based on the operation of the switching circuit when the power switch is turned on to bring the operating current source into an operating state; a first delay circuit connected to the power supply; and a first delay circuit connected to the power supply so as to delay the operating current source by a second predetermined period of time based on the operation of the switching circuit when the power switch is turned off, so that the operating current source is in an inactive state. a second delay circuit configured to operate the differential amplifier after stably operating the amplifier when the power switch is turned on, and stop operation of the differential amplifier when the power switch is turned off. 1. A pop sound prevention circuit, characterized in that the operation of the amplifier is stopped after the differential amplifier is activated, thereby preventing pop sounds from being generated from the output of the differential amplifier. (2) The first predetermined time is the time required to operate the differential amplifier after stably operating the amplifier, and the second predetermined time is the time required to operate the differential amplifier after stably operating the amplifier, and the second predetermined time is the time required to operate the differential amplifier after stably operating the amplifier. 2. The pop noise prevention circuit according to claim 1, wherein the pop noise prevention circuit is the time required to stop the operation of the differential amplifier. (3) The pop noise prevention circuit according to claim (1), wherein the first and second delay circuits are capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13180089U JPH0722898Y2 (en) | 1989-11-13 | 1989-11-13 | Pop noise prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13180089U JPH0722898Y2 (en) | 1989-11-13 | 1989-11-13 | Pop noise prevention circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0370412U true JPH0370412U (en) | 1991-07-15 |
| JPH0722898Y2 JPH0722898Y2 (en) | 1995-05-24 |
Family
ID=31679286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13180089U Expired - Lifetime JPH0722898Y2 (en) | 1989-11-13 | 1989-11-13 | Pop noise prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722898Y2 (en) |
-
1989
- 1989-11-13 JP JP13180089U patent/JPH0722898Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0722898Y2 (en) | 1995-05-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |