JPH0370440U - - Google Patents

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Publication number
JPH0370440U
JPH0370440U JP13074289U JP13074289U JPH0370440U JP H0370440 U JPH0370440 U JP H0370440U JP 13074289 U JP13074289 U JP 13074289U JP 13074289 U JP13074289 U JP 13074289U JP H0370440 U JPH0370440 U JP H0370440U
Authority
JP
Japan
Prior art keywords
converter
pseudo
circuit
power supply
telephone
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.)
Granted
Application number
JP13074289U
Other languages
English (en)
Other versions
JP2535410Y2 (ja
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1989130742U priority Critical patent/JP2535410Y2/ja
Publication of JPH0370440U publication Critical patent/JPH0370440U/ja
Application granted granted Critical
Publication of JP2535410Y2 publication Critical patent/JP2535410Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【図面の簡単な説明】
第1図は、本考案の疑似ベル音発生機能を有す
る電源回路の一実施例を説明するための回路図、
第2図は、疑似ベル音信号を説明するための波形
図である。 1……電話回線、3A,3B……子電話機、4
A,4B……オフフツク検出回路、5A,5B…
…選択リレー、6……DC−DCコンバータ、7
……フオトカプラ、SG……呼出制御信号、OH
a,OHb……オフフツク検出信号。

Claims (1)

    【実用新案登録請求の範囲】
  1. 電話機の電源回路において、定電流出力特性を
    有するDC−DCコンバータと該DC−DCコン
    バータの出力を短絡するように接続された疑似ベ
    ル音信号によつて断続されるスイツチング回路と
    前記DC−DCコンバータの出力側に選択スイツ
    チを介して接続された複数の電話機とを具備し、
    該電話機のオフフツク検出回路により前記疑似ベ
    ル音信号を制御することを特徴とする疑似ベル音
    発生機能を有する電源回路。
JP1989130742U 1989-11-09 1989-11-09 内線電話機の電源回路 Expired - Lifetime JP2535410Y2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1989130742U JP2535410Y2 (ja) 1989-11-09 1989-11-09 内線電話機の電源回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989130742U JP2535410Y2 (ja) 1989-11-09 1989-11-09 内線電話機の電源回路

Publications (2)

Publication Number Publication Date
JPH0370440U true JPH0370440U (ja) 1991-07-15
JP2535410Y2 JP2535410Y2 (ja) 1997-05-14

Family

ID=31678294

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1989130742U Expired - Lifetime JP2535410Y2 (ja) 1989-11-09 1989-11-09 内線電話機の電源回路

Country Status (1)

Country Link
JP (1) JP2535410Y2 (ja)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58123264A (ja) * 1982-01-19 1983-07-22 Nec Corp リンガ回路

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58123264A (ja) * 1982-01-19 1983-07-22 Nec Corp リンガ回路

Also Published As

Publication number Publication date
JP2535410Y2 (ja) 1997-05-14

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term