JPS59149768U - telephone circuit - Google Patents
telephone circuitInfo
- Publication number
- JPS59149768U JPS59149768U JP4352483U JP4352483U JPS59149768U JP S59149768 U JPS59149768 U JP S59149768U JP 4352483 U JP4352483 U JP 4352483U JP 4352483 U JP4352483 U JP 4352483U JP S59149768 U JPS59149768 U JP S59149768U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- line terminal
- telephone circuit
- line
- connection point
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来例を示した回路図、第２図は本考案の一実
施例を示す回路図である。
１・・・・・・線路端子、２・・・・・・線路端子、３
〜７・・曲 −抵抗器、８・・・・・・コンデンサ、
９・・・・・・ＮＰＮ ）ランジスタ、１０・・・・・
・送話プリアンプ、１１・・曲線路インピーダンス、１
２・・曲切換スイッチ、１３゜１４・・・・・・抵抗器
、１５・・・二・・受話回路、２０・・曲目 ゛動
音量調整回路、２１・・・・・・抵抗器、２２・・川・
コンデンサ。FIG. 1 is a circuit diagram showing a conventional example, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1...Line terminal, 2...Line terminal, 3
~7...Song -Resistor, 8...Capacitor,
9...NPN) transistor, 10...
・Transmission preamplifier, 11...Curved road impedance, 1
2...Tune selection switch, 13゜14...Resistor, 15...2...Receiver circuit, 20...Track number ゛Dynamic volume adjustment circuit, 21...Resistor, 22 ··river·
capacitor.
Claims (1)
に接続し、コレクタは第１の抵抗を介して第１の線路端
子へ接続し、エミッタは第３の抵抗を介して第６の抵抗
の１端に接続し、前記第６の抵抗の他端は第２の線路端
子に接続し、前記第１の抵抗と前記トランジスタのコレ
クタの接続点に第２の抵抗の１端を接続し、前記第２の
抵抗の他端を第４の抵抗の１端に接続し、前記第４の抵
抗の他端は第７の抵抗を介して前記第２の線路端子に接
続され、前記第２と第４の抵抗の接続点からコンデンサ
を介して第５の抵抗が前記第２の線路端子へ接続され、
受話回路が、前記第１の線路端子と、前記第４と第２の
抵抗の接続点に接続された電話機回路において、線路が
短かい場合には前記第４の抵抗と第７の抵抗の接続点を
前記第２の線路端子に接続し、線路が長い場合には前記
第３と第６の抵抗の接続点を前記第２の線路端子へ接続
するスイッチを具備したことを特徴とする電話機回路。The output of the transmitting amplifier including the transmitter is connected to the base of the transistor, the collector is connected to the first line terminal through the first resistor, and the emitter is connected to the sixth resistor through the third resistor. one end of the sixth resistor, the other end of the sixth resistor is connected to a second line terminal, one end of the second resistor is connected to a connection point between the first resistor and the collector of the transistor, The other end of the second resistor is connected to one end of a fourth resistor, the other end of the fourth resistor is connected to the second line terminal via a seventh resistor, and the other end of the fourth resistor is connected to the second line terminal through a seventh resistor. A fifth resistor is connected from the connection point of the fourth resistor to the second line terminal via a capacitor,
In a telephone circuit in which the receiver circuit is connected to the connection point between the first line terminal and the fourth and second resistors, if the line is short, the connection between the fourth resistor and the seventh resistor. A telephone circuit, characterized in that the telephone circuit is equipped with a switch that connects the connecting point of the third and sixth resistors to the second line terminal when the line is long. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4352483U JPS59149768U (en) | 1983-03-26 | 1983-03-26 | telephone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4352483U JPS59149768U (en) | 1983-03-26 | 1983-03-26 | telephone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59149768U true JPS59149768U (en) | 1984-10-06 |
Family
ID=30174060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4352483U Pending JPS59149768U (en) | 1983-03-26 | 1983-03-26 | telephone circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59149768U (en) |
-
1983
- 1983-03-26 JP JP4352483U patent/JPS59149768U/en active Pending
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