JPH044417U - - Google Patents
Info
- Publication number
- JPH044417U JPH044417U JP4410290U JP4410290U JPH044417U JP H044417 U JPH044417 U JP H044417U JP 4410290 U JP4410290 U JP 4410290U JP 4410290 U JP4410290 U JP 4410290U JP H044417 U JPH044417 U JP H044417U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- resistor
- collector
- base
- miute
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Amplifiers (AREA)
Description
第１図はこの考案に係る車載用音響機器の制御
回路の実施例を示し、第１図ａは回路図、第１図
ｂはこの考案の他の実施例の回路図である。第２
図は従来の実施例のブロツク図である。
主な符号の説明、１……電源スイツチ、２……
電源、４，８，１２……トランジスタ、６，７…
…コンデンサ。
FIG. 1 shows an embodiment of a control circuit for a vehicle-mounted audio device according to this invention, FIG. 1a is a circuit diagram, and FIG. 1b is a circuit diagram of another embodiment of this invention. Second
The figure is a block diagram of a conventional embodiment. Explanation of main symbols, 1...Power switch, 2...
Power supply, 4, 8, 12... Transistor, 6, 7...
...capacitor.
Claims (1)
チと、負荷を接続するための出力端子と、前記電
源にコレクタを接続し前記出力端子にエミツタを
接続する第１のトランジスタと、前記第１のトラ
ンジスタのベース・コレクタ間に設けた第１の抵
抗器と、前記第１のトランジスタのコレクタとグ
ランド間に設けた第１のコンデンサと、前記第１
のトランジスタのベースとグランド間に設けた第
２のコンデンサと、前記電源スイツチをオフ状態
にした時、前記第１のトランジスタのベース電位
を略グランドの電位に降下せしめる第２のトラン
ジスタと、前記第１の抵抗器に並列に設け、且つ
、直列に接続した第２の抵抗器及び第３の抵抗器
と、ミユート回路制御用のミユート制御端子と、
前記ミユート制御端子にコレクタを接続し、エミ
ツタを第１のコンデンサの（＋）電極に接続し、
ベースを第２の抵抗器と第３の抵抗器との接続線
路に接続した第３のトランジスタとで構成したこ
とを特徴とする車載用音響機器の制御回路。 A power supply, a power switch for turning on and off the power supply, an output terminal for connecting a load, a first transistor having a collector connected to the power supply and an emitter connected to the output terminal, and the first transistor a first resistor provided between the base and collector of the first transistor; a first capacitor provided between the collector of the first transistor and ground;
a second capacitor provided between the base of the transistor and ground; a second transistor that lowers the base potential of the first transistor to approximately the ground potential when the power switch is turned off; a second resistor and a third resistor provided in parallel with the first resistor and connected in series; a miute control terminal for controlling the miute circuit;
A collector is connected to the miute control terminal, an emitter is connected to the (+) electrode of the first capacitor,
1. A control circuit for a vehicle-mounted audio device, characterized in that the base includes a third transistor connected to a connection line between a second resistor and a third resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4410290U JPH044417U (en) | 1990-04-26 | 1990-04-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4410290U JPH044417U (en) | 1990-04-26 | 1990-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH044417U true JPH044417U (en) | 1992-01-16 |
Family
ID=31557103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4410290U Pending JPH044417U (en) | 1990-04-26 | 1990-04-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH044417U (en) |
-
1990
- 1990-04-26 JP JP4410290U patent/JPH044417U/ja active Pending