JPS6226918U - - Google Patents
Info
- Publication number
- JPS6226918U JPS6226918U JP11647185U JP11647185U JPS6226918U JP S6226918 U JPS6226918 U JP S6226918U JP 11647185 U JP11647185 U JP 11647185U JP 11647185 U JP11647185 U JP 11647185U JP S6226918 U JPS6226918 U JP S6226918U
- Authority
- JP
- Japan
- Prior art keywords
- output amplifier
- speakers
- switch
- voltage
- detection means
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
Landscapes
- Amplifiers (AREA)
Description
第１図は本考案の一実施例である音声出力増幅
器用ＩＣの保護回路図、第２図は従来装置の回路
図である。
１０……内部スピーカ、２０……外部スピーカ
、１５……音声出力増幅器、３０……異常電圧検
出回路、４０……帰還型定電圧回路、Ｔｒ１，Ｔ
ｒ２，Ｔｒ３，Ｔｒ４……トランジスタ、Ｄ１，
Ｄ２……ツエナーダイオード、ＲＯ……抵抗、Ｓ
Ｗ……スイツチ。
FIG. 1 is a protection circuit diagram of an audio output amplifier IC which is an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional device. 10...Internal speaker, 20...External speaker, 15...Audio output amplifier, 30...Abnormal voltage detection circuit, 40...Feedback type constant voltage circuit, Tr1, T
r2, Tr3, Tr4...transistor, D1,
D2... Zener diode, RO... Resistor, S
W...Switch.
Claims (1)
ーカの接続端子を設け、これらの端子に接続され
るスピーカをスイツチで切替えて使用する音響機
器において、出力増幅器の外部スピーカ接続端子
のリターン側に抵抗を挿入して、該抵抗の両端に
発生する電圧が所定値を超えたときその電圧を検
出手段により検出し、該検出手段の検出出力によ
り前記出力増幅器を構成するＩＣに供給する直流
電圧を低下させるよう直流電源回路を制御する制
御回路を設けたことを特徴とする音声出力増幅器
用ＩＣの保護回路。 In addition to the internal speakers that come with the main unit, in audio equipment that has connection terminals for external speakers and uses a switch to switch between the speakers connected to these terminals, insert a resistor on the return side of the external speaker connection terminal of the output amplifier. Then, when the voltage generated across the resistor exceeds a predetermined value, the voltage is detected by the detection means, and the detection output of the detection means is used to reduce the DC voltage supplied to the IC constituting the output amplifier. A protection circuit for an IC for an audio output amplifier, characterized in that a control circuit for controlling a DC power supply circuit is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11647185U JPS6226918U (en) | 1985-07-31 | 1985-07-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11647185U JPS6226918U (en) | 1985-07-31 | 1985-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6226918U true JPS6226918U (en) | 1987-02-18 |
Family
ID=31001092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11647185U Pending JPS6226918U (en) | 1985-07-31 | 1985-07-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6226918U (en) |
-
1985
- 1985-07-31 JP JP11647185U patent/JPS6226918U/ja active Pending
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