JPS5813760U

JPS5813760U - telephone circuit

Info

Publication number: JPS5813760U
Application number: JP10543081U
Authority: JP
Inventors: 水越　重幸
Original assignee: 岩崎通信機株式会社
Priority date: 1981-07-17
Filing date: 1981-07-17
Publication date: 1983-01-28

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

[Brief explanation of drawings]

第１図、第２図は従来の電話機回路を示すもので、第１
図はダイヤル回路を除いた電話機回路を示す図、第２図
はダイヤル回路を示す図、第３図、第４図はこの考案の
一実施例を示すもので、第３図はダイヤル回路を除いた
電話機回路を示す図、第４図はダイヤル回路を示す図で
ある。図中、Ｌ□＋　”２は局線端子、Ｄ３は整流ブリッジ、
Ｈ８２はフックスイッチ、ＮＥＴは通話回路、Ｔは送話
器、Ｒは受話器、ＬＴは誘導線輪、Ｂはベル、）（１，
）ｆ２．　）（３，Ｌは通話回路入力端子、ＴＲ１、Ｔ
Ｒ２はトランジスタ、Ｒｏ、　Ｒ１，Ｒ２は抵抗器、Ｃ
はコンデンサ、ＸＴＡＬは水晶発振器、ＤＺはツェナダ
イオード、ＰＢはキーボード、ＩＣは集積素子、Ｈ８３
はトランスファスイッチ、Ｄｏは定電流ダイオード、Ｄ
□はダイオードである。Figures 1 and 2 show conventional telephone circuits.
Figure 2 shows the telephone circuit excluding the dial circuit, Figure 2 shows the dial circuit, Figures 3 and 4 show an embodiment of this invention, and Figure 3 shows the telephone circuit excluding the dial circuit. FIG. 4 is a diagram showing a dial circuit. In the figure, L□+"2 is the office line terminal, D3 is the rectifier bridge,
H82 is a hook switch, NET is a communication circuit, T is a transmitter, R is a receiver, LT is a guide ring, B is a bell, ) (1,
) f2. ) (3, L is the communication circuit input terminal, TR1, T
R2 is a transistor, Ro, R1, R2 are resistors, C
is a capacitor, XTAL is a crystal oscillator, DZ is a Zener diode, PB is a keyboard, IC is an integrated element, H83
is a transfer switch, Do is a constant current diode, D
□ is a diode.

Claims

[Scope of utility model registration request]

A dial circuit and a telephone call circuit are connected between the office line terminals via hook switches, respectively, and the dial circuit is connected to a dial integrated circuit element that is set and reset by the on/off operation of the hook switch. In a telephone circuit consisting of a keyboard and a
A telephone circuit characterized in that a transfer switch is provided to apply a high potential from the office line terminal to the set/reset terminal of the dial integrated circuit element when the hook switch is off-hook, and to apply a low potential when the hook switch is on-hook.