JPS643357U - - Google Patents
Info
- Publication number
- JPS643357U JPS643357U JP9821387U JP9821387U JPS643357U JP S643357 U JPS643357 U JP S643357U JP 9821387 U JP9821387 U JP 9821387U JP 9821387 U JP9821387 U JP 9821387U JP S643357 U JPS643357 U JP S643357U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- control circuit
- state
- input
- beginning
- 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
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Devices For Supply Of Signal Current (AREA)
Description
第１図は従来の多機能電話機の構成を示す。第
２図はコントロール回路の付近をさらに詳細に示
し、第３図はその電源回路を示すものである。第
４図は本考案による構成を示し、第５図は第４図
の点Ａ，Ｂ，Ｃ，Ｄにおけるレベルの高低と時間
的変化を示すものである。
１……電話回線への接続端子、２Ａ，２Ｂ……
フツクスイツチ、３……着信回路、４……コント
ロール回路、５……ダイヤル用キースイツチ、６
……通話回路、７，８，１３，１４……トランジ
スタ。
FIG. 1 shows the configuration of a conventional multifunction telephone. FIG. 2 shows the vicinity of the control circuit in more detail, and FIG. 3 shows its power supply circuit. FIG. 4 shows the configuration according to the present invention, and FIG. 5 shows the level changes and temporal changes at points A, B, C, and D in FIG. 4. 1...Connection terminal to telephone line, 2A, 2B...
Hook switch, 3... Incoming call circuit, 4... Control circuit, 5... Dial key switch, 6
...Communication circuit, 7, 8, 13, 14...transistor.
Claims (1)
１のトランジスタと、その接地側に接続され定常
状態の通話状態においてコントロール回路からの
入力により制御されて第１のトランジスタを導通
させるための第２のトランジスタと、第１のトラ
ンジスタの入力側に接続され第２のトランジスタ
と並列に接続されコントロール回路からの入力に
より制御され通話状態の初期に第２のトランジス
タの導通時に導通する第３のトランジスタを設け
、通話状態の初期に第１のトランジスタを速やか
に導通させる切換回路を備えた電話機の電源回路
。 a first transistor that supplies power to a control circuit of the telephone; a second transistor that is connected to the ground side of the first transistor and is controlled by an input from the control circuit in a steady state talking state to make the first transistor conductive; , a third transistor is provided which is connected to the input side of the first transistor, is connected in parallel with the second transistor, is controlled by the input from the control circuit, and is turned on when the second transistor is turned on at the beginning of the call state, A telephone power supply circuit comprising a switching circuit that quickly turns on a first transistor at the beginning of a state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9821387U JPS643357U (en) | 1987-06-25 | 1987-06-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9821387U JPS643357U (en) | 1987-06-25 | 1987-06-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS643357U true JPS643357U (en) | 1989-01-10 |
Family
ID=31324276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9821387U Pending JPS643357U (en) | 1987-06-25 | 1987-06-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS643357U (en) |
-
1987
- 1987-06-25 JP JP9821387U patent/JPS643357U/ja active Pending
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