JPS61171384U - - Google Patents
Info
- Publication number
- JPS61171384U JPS61171384U JP5351885U JP5351885U JPS61171384U JP S61171384 U JPS61171384 U JP S61171384U JP 5351885 U JP5351885 U JP 5351885U JP 5351885 U JP5351885 U JP 5351885U JP S61171384 U JPS61171384 U JP S61171384U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmitted
- main device
- transistor
- signals
- 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 2
- 230000008054 signal transmission Effects 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Noise Elimination (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図ないし第５図はそれぞれ主装置送信出力および
ラジオ音声出力の一例を示す波形図、第６図は子
機送信出力の一例を示す波形図である。
１……主装置側回路、２……子機側回路、３…
…非共通側信号線、１１……送信回路、Ｃ１２…
…コンデンサ、Ｑ１１……トランジスタ、Ｒ１１
……バイアス用抵抗器。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
5 through 5 are waveform diagrams showing an example of the main device transmission output and radio audio output, respectively, and FIG. 6 is a waveform diagram showing an example of the slave device transmission output. 1...Main unit side circuit, 2...Slave unit side circuit, 3...
...Uncommon side signal line, 11... Transmission circuit, C12...
...Capacitor, Q11...Transistor, R11
...Bias resistor.
Claims (1)
接続し、主装置からの信号送信を信号線に対する
電源の供給断続により行ない、ボタン電話機から
の信号送信を信号線の線間インピーダンス変化に
より行なうボタン電話装置の信号伝送回路におい
て、主装置側に、信号線と直列に挿入されて送信
信号に応じてオフとなるトランジスタと、このト
ランジスタのコレクタ・ベース間に接続されたバ
イアス用抵抗器と、このバイアス用抵抗器に並列
に接続された小容量値のコンデンサとを含む送信
部を設けたことを特徴とするボタン電話装置の信
号伝送回路。 A pair of signal wires connects the main device and the key telephone, and signals are transmitted from the main device by intermittent power supply to the signal wire, and signals are transmitted from the key telephone by changing the impedance between the signal wires. In the signal transmission circuit of a button telephone device, a transistor is inserted in series with the signal line on the main device side and turns off in response to the transmitted signal, and a bias resistor is connected between the collector and base of this transistor. A signal transmission circuit for a button telephone device, characterized in that a transmitter includes a capacitor with a small capacitance connected in parallel to the bias resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5351885U JPS61171384U (en) | 1985-04-12 | 1985-04-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5351885U JPS61171384U (en) | 1985-04-12 | 1985-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61171384U true JPS61171384U (en) | 1986-10-24 |
Family
ID=30574458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5351885U Pending JPS61171384U (en) | 1985-04-12 | 1985-04-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61171384U (en) |
-
1985
- 1985-04-12 JP JP5351885U patent/JPS61171384U/ja active Pending
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