JPH02120931U - - Google Patents

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Publication number
JPH02120931U
JPH02120931U JP2504790U JP2504790U JPH02120931U JP H02120931 U JPH02120931 U JP H02120931U JP 2504790 U JP2504790 U JP 2504790U JP 2504790 U JP2504790 U JP 2504790U JP H02120931 U JPH02120931 U JP H02120931U
Authority
JP
Japan
Prior art keywords
transistor
voltage
power supply
output
primary side
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
Application number
JP2504790U
Other languages
English (en)
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 JP2504790U priority Critical patent/JPH02120931U/ja
Publication of JPH02120931U publication Critical patent/JPH02120931U/ja
Pending legal-status Critical Current

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  • Logic Circuits (AREA)

Description

【図面の簡単な説明】
第1図は本考案に係る符号化端局装置のSR信
号レベル変換回路の一実施例の回路図、第2図は
従来の符号化端局装置のSR信号レベル変換回路
の回路図を示す。 1……論理回路、2……論理レベルSR信号、
3……2次側電源装置、4……−12V端子出力
線、5……抵抗分割回路、6……PNP形トラン
ジスタ、7……SR信号送出端子、8……1次側
負電源入力端子。

Claims (1)

  1. 【実用新案登録請求の範囲】 符号化端局装置のSR信号レベル変換回路にお
    いて、 1次側負電源とこの1次側負電圧を入力として
    2次側電圧を供給する電源装置を有し、 出力段にPNP形トランジスタを用い、 前記トランジスタのエミツタを地気に接続し、 前記トランジスタのベースを前記2次側電源装
    置のプラス側の出力電圧で動作する論理回路の出
    力と前記1次側負電圧との間の電圧を抵抗で分圧
    した中間接続点に接続し、 前記トランジスタのコレクタを開放または地気
    を送出する出力端子とすることを特徴とする符号
    化端局装置のSR信号レベル変換回路。
JP2504790U 1990-03-15 1990-03-15 Pending JPH02120931U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2504790U JPH02120931U (ja) 1990-03-15 1990-03-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2504790U JPH02120931U (ja) 1990-03-15 1990-03-15

Publications (1)

Publication Number Publication Date
JPH02120931U true JPH02120931U (ja) 1990-10-01

Family

ID=31245431

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2504790U Pending JPH02120931U (ja) 1990-03-15 1990-03-15

Country Status (1)

Country Link
JP (1) JPH02120931U (ja)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337549U (ja) * 1976-09-07 1978-04-01
JPS5444192A (en) * 1977-09-13 1979-04-07 Toshiba Corp Control red driving system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337549U (ja) * 1976-09-07 1978-04-01
JPS5444192A (en) * 1977-09-13 1979-04-07 Toshiba Corp Control red driving system

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