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JPS56149888A - On-off signal detecting circuit from terminal equipment - Google Patents

On-off signal detecting circuit from terminal equipment

Info

Publication number
JPS56149888A
JPS56149888A JP5373680A JP5373680A JPS56149888A JP S56149888 A JPS56149888 A JP S56149888A JP 5373680 A JP5373680 A JP 5373680A JP 5373680 A JP5373680 A JP 5373680A JP S56149888 A JPS56149888 A JP S56149888A
Authority
JP
Japan
Prior art keywords
differential amplifier
input
terminal equipment
detecting circuit
signal detecting
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
JP5373680A
Other languages
Japanese (ja)
Inventor
Tsuguo Hata
Toshiaki Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP5373680A priority Critical patent/JPS56149888A/en
Publication of JPS56149888A publication Critical patent/JPS56149888A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of DC pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)

Abstract

PURPOSE:To prevent generation of an unnecessary pulse and exactly detect only prescribed ON and OFF signals, by connecting a rectifier between the input terminals of a differential amplifier for detecting ON and OFF signals. CONSTITUTION:When signal voltage of the point A, which is generated corresponding to ON and OFF of the relay contact Di is directly input to the differential amplifier AMP, it sometimes exceeds the input tolerance of the differential amplifier, therefore, it is prevented that excessive voltage is applied to the differential amplifier, by connecting a rectifier D1 between the input terminals of the differential amplifier, and clamping the potential which is below the reference voltage of the reference voltage source V2 in one input terminal C.
JP5373680A 1980-04-22 1980-04-22 On-off signal detecting circuit from terminal equipment Pending JPS56149888A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5373680A JPS56149888A (en) 1980-04-22 1980-04-22 On-off signal detecting circuit from terminal equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5373680A JPS56149888A (en) 1980-04-22 1980-04-22 On-off signal detecting circuit from terminal equipment

Publications (1)

Publication Number Publication Date
JPS56149888A true JPS56149888A (en) 1981-11-19

Family

ID=12951105

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5373680A Pending JPS56149888A (en) 1980-04-22 1980-04-22 On-off signal detecting circuit from terminal equipment

Country Status (1)

Country Link
JP (1) JPS56149888A (en)

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