JPS6181245U - - Google Patents
Info
- Publication number
- JPS6181245U JPS6181245U JP16475784U JP16475784U JPS6181245U JP S6181245 U JPS6181245 U JP S6181245U JP 16475784 U JP16475784 U JP 16475784U JP 16475784 U JP16475784 U JP 16475784U JP S6181245 U JPS6181245 U JP S6181245U
- Authority
- JP
- Japan
- Prior art keywords
- detecting
- lines
- telephone
- hook
- signal generated
- 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
- 230000007423 decrease Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
Description
第１図はこの考案装置の一例の回路図、第２図
はその説明のための図、第３図は従来回路の一例
の回路図である。
Ｌ１及びＬ２は電話回線、Ｃ１は直流阻止用の
コンデンサ、Ｑ１は交流信号の増幅用のトランジ
スタ、Ｑ２は交流信号によつてオンオフされるト
ランジスタ、Ｄ２は発光ダイオードである。
FIG. 1 is a circuit diagram of an example of this invented device, FIG. 2 is an explanatory diagram thereof, and FIG. 3 is a circuit diagram of an example of a conventional circuit. L 1 and L 2 are telephone lines, C 1 is a capacitor for DC blocking, Q 1 is a transistor for amplifying AC signals, Q 2 is a transistor turned on and off by AC signals, and D 2 is a light emitting diode.
Claims (1)
流電圧が下がるとともに、この２本の回線に生じ
る交流信号を検出する手段と、その検出手段の出
力によつて点滅する表示手段とからなる電話回線
使用中の表示装置。 A telephone line consisting of a means for detecting an alternating current signal generated on the two lines when the telephone is taken off-hook and the direct current voltage between the two lines decreases, and a display means that blinks depending on the output of the detecting means. Display device in use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16475784U JPS6181245U (en) | 1984-10-31 | 1984-10-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16475784U JPS6181245U (en) | 1984-10-31 | 1984-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6181245U true JPS6181245U (en) | 1986-05-29 |
Family
ID=30722620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16475784U Pending JPS6181245U (en) | 1984-10-31 | 1984-10-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6181245U (en) |
-
1984
- 1984-10-31 JP JP16475784U patent/JPS6181245U/ja active Pending
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