JPH0178417U - - Google Patents
Info
- Publication number
- JPH0178417U JPH0178417U JP1987174710U JP17471087U JPH0178417U JP H0178417 U JPH0178417 U JP H0178417U JP 1987174710 U JP1987174710 U JP 1987174710U JP 17471087 U JP17471087 U JP 17471087U JP H0178417 U JPH0178417 U JP H0178417U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- control transistor
- transistor
- capacitor
- emitter
- 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 6
- 230000008054 signal transmission Effects 0.000 claims description 2
Landscapes
- Amplifiers (AREA)
Description
図示した回路は、本考案のミユーテイング回路
の一実施例である。
主な図番の説明、６……ミユーテイング用トラ
ンジスター、７……信号伝送路、９……電源スイ
ツチ、１０……定電圧電源回路、１２……制御ト
ランジスター、１３……第１ダイオード、１６…
…第１コンデンサー、１７……第２ダイオード、
１８……第３ダイオード、２０……時定数回路、
２１……第２コンデンサー。
The illustrated circuit is one embodiment of the muting circuit of the present invention. Explanation of main figure numbers, 6... Muting transistor, 7... Signal transmission path, 9... Power switch, 10... Constant voltage power supply circuit, 12... Control transistor, 13... First diode, 16...
...first capacitor, 17...second diode,
18...Third diode, 20 ...Time constant circuit,
21...Second capacitor.
Claims (1)
接続されていると共にオン状態にあるときミユー
テイング動作を成すミユーテイング用トランジス
ターと、該ミユーテイング用トランジスターの動
作を制御するべく接続されていると共にオン状態
にあるとき前記ミユーテイング用トランジスター
をオン状態にせしめる制御トランジスターと、電
源が供給されているとき出力端子に所定の直流電
圧を出力する定電圧電源回路と、該定電圧電源回
路の出力端子に出力される電圧を前記制御トラン
ジスターのエミツタに導く第１ダイオードと、前
記定電圧電源回路の出力端子に直流電圧が出力さ
れているとき第２ダイオードを通して常時充電さ
れた状態にある第１コンデンサーと、該第１コン
デンサーの充電端子と前記制御トランジスターの
エミツタとの間に接続されていると共に電源遮断
時該第１コンデンサーの放電電流を該制御トラン
ジスターのエミツタに導く第３ダイオードと、前
記制御トランジスターのベース回路に接続されて
いると共に電源投入時該制御トランジスターのベ
ース電圧を所定時間低電位に保持し、且つ電源遮
断時充電電荷が速やかに放電せしめられる第２コ
ンデンサーを含む時定数回路とより成るミユーテ
イング回路。 A muting transistor whose collector-emitter path is connected between the signal transmission path and ground and which performs a muting operation when in an on state, and which is connected to control the operation of the muting transistor and which is in an on state. a control transistor that turns on the mutating transistor; a constant voltage power supply circuit that outputs a predetermined DC voltage to an output terminal when power is supplied; and a voltage output to the output terminal of the constant voltage power supply circuit. a first diode that leads the voltage to the emitter of the control transistor; a first capacitor that is constantly charged through a second diode when a DC voltage is output to the output terminal of the constant voltage power supply circuit; a third diode connected between the charging terminal of the first capacitor and the emitter of the control transistor and guiding the discharge current of the first capacitor to the emitter of the control transistor when the power is cut off; and a third diode connected to the base circuit of the control transistor. and a time constant circuit including a second capacitor that holds the base voltage of the control transistor at a low potential for a predetermined time when the power is turned on, and quickly discharges the charge when the power is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987174710U JP2512951Y2 (en) | 1987-11-16 | 1987-11-16 | Muting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987174710U JP2512951Y2 (en) | 1987-11-16 | 1987-11-16 | Muting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0178417U true JPH0178417U (en) | 1989-05-26 |
| JP2512951Y2 JP2512951Y2 (en) | 1996-10-02 |
Family
ID=31466551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987174710U Expired - Lifetime JP2512951Y2 (en) | 1987-11-16 | 1987-11-16 | Muting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2512951Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020178148A (en) * | 2019-04-15 | 2020-10-29 | アルパイン株式会社 | Audio device |
-
1987
- 1987-11-16 JP JP1987174710U patent/JP2512951Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2512951Y2 (en) | 1996-10-02 |
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