JPH0485860U - - Google Patents
Info
- Publication number
- JPH0485860U JPH0485860U JP12790590U JP12790590U JPH0485860U JP H0485860 U JPH0485860 U JP H0485860U JP 12790590 U JP12790590 U JP 12790590U JP 12790590 U JP12790590 U JP 12790590U JP H0485860 U JPH0485860 U JP H0485860U
- Authority
- JP
- Japan
- Prior art keywords
- power
- microphone
- switch circuit
- power switch
- telephone
- 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
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Electronic Switches (AREA)
- Devices For Supply Of Signal Current (AREA)
Description
第１図は、この考案の一実施例による電源スイ
ツチ回路のブロツク図、第２図はこの考案の他の
実施例を示すブロツク図、第３図は従来の電源ス
イツチ回路を示すブロツク図である。
１は電源スイツチ回路、２はトランジスタスイ
ツチ、３は制御用トランジスタ、４はバイアス抵
抗、５は制御ライン、６はアンプ、７は直流遮断
コンデンサ、８は親装置、９は接続接栓、１０は
電圧源、１１はバイアス抵抗、１２は外部電源、
１３は負荷、１４はリレースイツチ、１５はダイ
オード、１６は機械接点スイツチ、１７はノブで
ある。なお、図中、同一符号は同一、または相当
部分を示す。
Fig. 1 is a block diagram of a power switch circuit according to one embodiment of this invention, Fig. 2 is a block diagram showing another embodiment of this invention, and Fig. 3 is a block diagram showing a conventional power switch circuit. . 1 is a power switch circuit, 2 is a transistor switch, 3 is a control transistor, 4 is a bias resistor, 5 is a control line, 6 is an amplifier, 7 is a DC cutoff capacitor, 8 is a parent device, 9 is a connection plug, 10 is a voltage source, 11 is a bias resistor, 12 is an external power supply,
13 is a load, 14 is a relay switch, 15 is a diode, 16 is a mechanical contact switch, and 17 is a knob. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
置において、マイク駆動用の電圧を読み取ること
によりトランジスタスイツチで自動的に電源の入
り切りを行うことを特徴とする電源スイツチ回路
。 A power switch circuit characterized in that in an external microphone and speaker device connected to a telephone, etc., the power is automatically turned on and off using a transistor switch by reading the voltage for driving the microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12790590U JPH0485860U (en) | 1990-11-28 | 1990-11-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12790590U JPH0485860U (en) | 1990-11-28 | 1990-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0485860U true JPH0485860U (en) | 1992-07-27 |
Family
ID=31875387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12790590U Pending JPH0485860U (en) | 1990-11-28 | 1990-11-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0485860U (en) |
-
1990
- 1990-11-28 JP JP12790590U patent/JPH0485860U/ja active Pending