JPS6284254U - - Google Patents
Info
- Publication number
- JPS6284254U JPS6284254U JP17370585U JP17370585U JPS6284254U JP S6284254 U JPS6284254 U JP S6284254U JP 17370585 U JP17370585 U JP 17370585U JP 17370585 U JP17370585 U JP 17370585U JP S6284254 U JPS6284254 U JP S6284254U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- diode
- base
- resistor
- pulse
- 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 3
- 238000010586 diagram Methods 0.000 description 8
Landscapes
- Devices For Supply Of Signal Current (AREA)
Description
第１図は本考案一実施例の回路図、第２図はダ
イオードの電圧―電流特性図、第３図は電圧波形
図で、イはダイヤル信号波形図、ロは時定数が非
常に小さいときの電圧波形図、ハは時定数が小さ
いときの電圧波形図、ニは時定数が適当なときの
電圧波形図、第４図は従来の回路図である。
２…フツクスイツチ、３…ダイオード、４…第
１抵抗、５…第２抵抗、６…コンデンサ、７…抵
抗、８，９，１４…トランジスタ、１０…パルス
ダイヤラーＩＣ。
Figure 1 is a circuit diagram of an embodiment of the present invention, Figure 2 is a voltage-current characteristic diagram of a diode, Figure 3 is a voltage waveform diagram, A is a dial signal waveform diagram, and B is a diagram when the time constant is very small. C is a voltage waveform diagram when the time constant is small, D is a voltage waveform diagram when the time constant is appropriate, and FIG. 4 is a conventional circuit diagram. 2... Hook switch, 3... Diode, 4... First resistor, 5... Second resistor, 6... Capacitor, 7... Resistor, 8, 9, 14... Transistor, 10... Pulse dialer IC.
Claims (1)
給されるパルスダイヤラーＩＣと、該トランジス
タおよび該パルスダイヤラーＩＣに並列に設けら
れ且つ直列に接続されたダイオードおよび第１抵
抗と、該ダイオードのカソードと該トランジスタ
のベース周に接続された第２抵抗と、該ダイオー
ドのアノードと該トランジスタのベース間に設け
られたコンデンサとを備え、 ダイヤルパルスのブレイク時に該第２抵抗と該
コンデンサにより前記トランジスタのベース・エ
ミツタ間電圧の上昇を抑制し、該トランジスタの
前記パルスダイヤラーＩＣへの供給電流を略一定
にすることを特徴とする電話機の定電流回路。[Claims for Utility Model Registration] A transistor, a pulse dialer IC to which current is supplied from the transistor, a diode and a first resistor provided in parallel and in series with the transistor and the pulse dialer IC, A second resistor connected to the cathode of the diode and the base of the transistor, and a capacitor provided between the anode of the diode and the base of the transistor, and when the dial pulse breaks, the second resistor and the capacitor A constant current circuit for a telephone, characterized in that a rise in voltage between the base and emitter of the transistor is suppressed, and a current supplied from the transistor to the pulse dialer IC is kept substantially constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17370585U JPS6284254U (en) | 1985-11-12 | 1985-11-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17370585U JPS6284254U (en) | 1985-11-12 | 1985-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6284254U true JPS6284254U (en) | 1987-05-29 |
Family
ID=31111418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17370585U Pending JPS6284254U (en) | 1985-11-12 | 1985-11-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6284254U (en) |
-
1985
- 1985-11-12 JP JP17370585U patent/JPS6284254U/ja active Pending
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