JPS633651U

JPS633651U -

Info

Publication number: JPS633651U
Application number: JP9733586U
Authority: JP
Priority date: 1986-06-25
Filing date: 1986-06-25
Publication date: 1988-01-11

Description

[Brief explanation of drawings]

第１図は本考案の一実施例におけるダイヤル送
出回路用電源回路を設けた電話機の概略構成図、
第２図は従来のダイヤル送出回路用電源回路を設
けた電話機の概略構成図である。１……回線、２……整流回路、３……通話回路
、４……ダイヤルパルス発生回路、４１……回線
断続用のトランジスタ、４２……制御用のトラン
ジスタ、５……ダイヤル回路、６……電源回路、
６１……定電流回路、６２……定電圧ダイオード
、６３……ダイオード、６４……メモリ保持用の
コンデンサ、６５……抵抗、７……ＤＴＭＦ信号
送出用の回路、８……フツクスイツチ。 FIG. 1 is a schematic configuration diagram of a telephone equipped with a dial sending circuit power supply circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a telephone equipped with a conventional power supply circuit for a dial sending circuit. DESCRIPTION OF SYMBOLS 1... Line, 2... Rectifier circuit, 3... Call circuit, 4... Dial pulse generation circuit, 41... Transistor for line disconnection, 42... Transistor for control, 5... Dial circuit, 6... ...power supply circuit,
61... Constant current circuit, 62... Constant voltage diode, 63... Diode, 64... Capacitor for memory retention, 65... Resistor, 7... DTMF signal sending circuit, 8... Hook switch.

Claims

[Scope of utility model registration request]

In a power supply circuit for a dial sending circuit that generates and supplies a predetermined power output from DC power supplied from the line side during off-hook to a dial sending circuit equipped with a volatile memory that stores predetermined dial information, a capacitor circuit that is charged by the power supply output and discharged during on-hook to supply this discharge current to the volatile memory of the dial sending circuit to retain the stored contents of the volatile memory; and a capacitor provided in parallel with the capacitor circuit. What is claimed is: 1. A power supply circuit for a dial sending circuit, comprising: a resistance circuit that stabilizes a discharge current supplied from the circuit to the volatile memory at a predetermined value.