JPS63163010U - - Google Patents
Info
- Publication number
- JPS63163010U JPS63163010U JP5564387U JP5564387U JPS63163010U JP S63163010 U JPS63163010 U JP S63163010U JP 5564387 U JP5564387 U JP 5564387U JP 5564387 U JP5564387 U JP 5564387U JP S63163010 U JPS63163010 U JP S63163010U
- Authority
- JP
- Japan
- Prior art keywords
- time constant
- turned
- switching transistor
- muting
- constant circuit
- 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 2
Landscapes
- Amplifiers (AREA)
Description
図は本考案の一実施例を示すものである。
１…スイツチングトランジスタ、３…第１時定
数回路、６…第２時定数回路、１５…ミユーテイ
ング駆動用トランジスタ。
The figure shows an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Switching transistor, 3 ... First time constant circuit, 6 ... Second time constant circuit, 15... Muting drive transistor.
Claims (1)
ングトランジスタと、このスイツチングトランジ
スタのベースと前記電源供給線路間に設けられた
第１時定数回路と、前記スイツチングトランジス
タのベースとアース間に設けられたコンデンサを
含む第２時定数回路と、前記スイツチングトラン
ジスタの出力にて制御されるミユーテイング駆動
用トランジスタとよりなり、電源オン時には直ち
に前記ミユーテイング駆動用トランジスタをオン
せしめると共に前記第１時定数回路の時定数にて
定まる時間経過後、前記スイツチングトランジス
タをオンとなし、以つてミユーテイング駆動用ト
ランジスタをオフせしめ、電源オフ時には前記第
２時定数回路のコンデンサの充電電位により前記
スイツチングトランジスタを直ちにオフせしめ、
以つてミユーテイング駆動用トランジスタをオン
せしめるようにしたことを特徴とするミユーテイ
ング回路。 a switching transistor disposed between the power supply line and the ground; a first time constant circuit disposed between the base of the switching transistor and the power supply line; and a first time constant circuit disposed between the base of the switching transistor and the ground. a second time constant circuit including a capacitor, and a muting drive transistor controlled by the output of the switching transistor, and when the power is turned on, the muting drive transistor is immediately turned on, and the first time constant circuit After the time determined by the time constant has elapsed, the switching transistor is turned on, thereby turning off the muting drive transistor, and when the power is turned off, the switching transistor is immediately turned on by the charging potential of the capacitor of the second time constant circuit. Turn off,
A muting circuit characterized in that a mutating drive transistor is turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987055643U JPH0528808Y2 (en) | 1987-04-13 | 1987-04-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987055643U JPH0528808Y2 (en) | 1987-04-13 | 1987-04-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63163010U true JPS63163010U (en) | 1988-10-25 |
| JPH0528808Y2 JPH0528808Y2 (en) | 1993-07-23 |
Family
ID=30883731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987055643U Expired - Lifetime JPH0528808Y2 (en) | 1987-04-13 | 1987-04-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0528808Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6240807A (en) * | 1985-08-19 | 1987-02-21 | Matsushita Electric Ind Co Ltd | Muting circuit |
-
1987
- 1987-04-13 JP JP1987055643U patent/JPH0528808Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6240807A (en) * | 1985-08-19 | 1987-02-21 | Matsushita Electric Ind Co Ltd | Muting circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0528808Y2 (en) | 1993-07-23 |