JPS6338437U - - Google Patents
Info
- Publication number
- JPS6338437U JPS6338437U JP13122086U JP13122086U JPS6338437U JP S6338437 U JPS6338437 U JP S6338437U JP 13122086 U JP13122086 U JP 13122086U JP 13122086 U JP13122086 U JP 13122086U JP S6338437 U JPS6338437 U JP S6338437U
- Authority
- JP
- Japan
- Prior art keywords
- oscillator
- capacitor
- switching element
- incoming call
- call notification
- 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 4
- 238000001514 detection method Methods 0.000 claims 1
- 238000009499 grossing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Description
図は本考案の実施例を示す要部の回路図である
。
２……ＲＥＣ（整流回路）、３……ＯＳＣ（発
振器）、Ｌ１，Ｌ２……線路端子、Ｃ１，Ｃ２…
…コンデンサ、Ｒ１〜Ｒ４……抵抗器、ＺＤ１，
ＺＤ２……定電圧ダイオード、Ｑ１，Ｑ２……Ｔ
Ｒ（トランジスタ）、Ｘ……素子（電気音響変換
素子）。
The figure is a circuit diagram of a main part showing an embodiment of the present invention. 2...REC (rectifier circuit), 3...OSC (oscillator), L1 , L2 ...Line terminal, C1 , C2 ...
... Capacitor, R 1 to R 4 ... Resistor, ZD 1 ,
ZD 2 ... Constant voltage diode, Q 1 , Q 2 ...T
R (transistor), X... element (electroacoustic transducer).
Claims (1)
から発振器を動作させ、該発振器の出力により電
気音響変換素子を駆動する電話機の着信報知回路
において、前記コンデンサと発振器との間へ挿入
されたスイツチング素子と、前記コンデンサの端
子電圧低下を検出し該検出に応じて前記スイツチ
ング素子をオフとする制御手段とを設けたことを
特徴とする電話機の着信報知回路。 A switching element inserted between the capacitor and the oscillator in an incoming call notification circuit for a telephone that operates an oscillator after rectifying and smoothing the ringing signal with a capacitor, and drives an electroacoustic transducer with the output of the oscillator; An incoming call notification circuit for a telephone set, further comprising control means for detecting a drop in terminal voltage of the capacitor and turning off the switching element in response to the detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13122086U JPS6338437U (en) | 1986-08-29 | 1986-08-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13122086U JPS6338437U (en) | 1986-08-29 | 1986-08-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6338437U true JPS6338437U (en) | 1988-03-12 |
Family
ID=31029465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13122086U Pending JPS6338437U (en) | 1986-08-29 | 1986-08-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6338437U (en) |
-
1986
- 1986-08-29 JP JP13122086U patent/JPS6338437U/ja active Pending