JPS5724192A - Scanning circuit - Google Patents

Scanning circuit

Info

Publication number
JPS5724192A
JPS5724192A JP9953880A JP9953880A JPS5724192A JP S5724192 A JPS5724192 A JP S5724192A JP 9953880 A JP9953880 A JP 9953880A JP 9953880 A JP9953880 A JP 9953880A JP S5724192 A JPS5724192 A JP S5724192A
Authority
JP
Japan
Prior art keywords
circuit
circuit consisting
bridge
slice
voltage
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
JP9953880A
Other languages
Japanese (ja)
Inventor
Tatsuo Yokoyama
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP9953880A priority Critical patent/JPS5724192A/en
Publication of JPS5724192A publication Critical patent/JPS5724192A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To achieve small sized and economical circuit constitution, by connecting a row designation circuit having a transistor (TR) at one side of a bridge circuit consisting of resistors and connecting a voltage detection circuit consisting of an amplifier to a voltage slice circuit consisting of Zener diode. CONSTITUTION:The circuit consists of a bridge circuit consisting of resistors R0- R6, row designation circuit consisting of a TR which is connected to one side of the bridge for row designation, and a voltage slice circuit consisting of a Zener diode ZD to detect a potential difference more than a given level produced at the bridge circuit through closing of a scanned point P of a marker. An output which can identify the state of a contact P can be obtained at the output terminal of AMP of a voltage detection circuit connected to the slice circuit. Thus, the scanning circuit for an automatic telephone exchanger can be constituted easily, by using components of low cost and less dispersion in accuracy.
JP9953880A 1980-07-21 1980-07-21 Scanning circuit Pending JPS5724192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9953880A JPS5724192A (en) 1980-07-21 1980-07-21 Scanning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9953880A JPS5724192A (en) 1980-07-21 1980-07-21 Scanning circuit

Publications (1)

Publication Number Publication Date
JPS5724192A true JPS5724192A (en) 1982-02-08

Family

ID=14249968

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9953880A Pending JPS5724192A (en) 1980-07-21 1980-07-21 Scanning circuit

Country Status (1)

Country Link
JP (1) JPS5724192A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58183293U (en) * 1982-05-28 1983-12-06 千手　昌子 Dust removal device
US4755364A (en) * 1986-05-29 1988-07-05 Rockwell International Corporation Liquid phase epitaxy apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58183293U (en) * 1982-05-28 1983-12-06 千手　昌子 Dust removal device
US4755364A (en) * 1986-05-29 1988-07-05 Rockwell International Corporation Liquid phase epitaxy apparatus and method

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