JPS54122011A - Direct-current loop circuit - Google Patents

Direct-current loop circuit

Info

Publication number
JPS54122011A
JPS54122011A JP2924078A JP2924078A JPS54122011A JP S54122011 A JPS54122011 A JP S54122011A JP 2924078 A JP2924078 A JP 2924078A JP 2924078 A JP2924078 A JP 2924078A JP S54122011 A JPS54122011 A JP S54122011A
Authority
JP
Japan
Prior art keywords
circuit
loop circuit
direct
mentioned
current loop
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
JP2924078A
Other languages
Japanese (ja)
Other versions
JPS5653910B2 (en
Inventor
Isamu Ueki
Makoto Shinooka
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2924078A priority Critical patent/JPS54122011A/en
Publication of JPS54122011A publication Critical patent/JPS54122011A/en
Publication of JPS5653910B2 publication Critical patent/JPS5653910B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

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

Abstract

PURPOSE:To obtain a miniature and economical DC loop circuit for an automatic switchboard with the circuit constitution which can be IC-implemented. CONSTITUTION:Bias circuit 38 consists of transistor 22, resistances 23, 25 and 26, and capacitor 24, and the DC impedance is varied linearly from a biased voltage value. Constant-current circuit 39, consisting of diodes 27, 28, 34, and 35, transistors 29 and 33, and resistances 30 to 32, should have a value for the compensation as much as the above-mentioned biased value. Then, above-mentioned bias circuit 38 and above-mentioned constant-current circuit 29 are connected in parallel.
JP2924078A 1978-03-16 1978-03-16 Direct-current loop circuit Granted JPS54122011A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2924078A JPS54122011A (en) 1978-03-16 1978-03-16 Direct-current loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2924078A JPS54122011A (en) 1978-03-16 1978-03-16 Direct-current loop circuit

Publications (2)

Publication Number Publication Date
JPS54122011A true JPS54122011A (en) 1979-09-21
JPS5653910B2 JPS5653910B2 (en) 1981-12-22

Family

ID=12270709

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2924078A Granted JPS54122011A (en) 1978-03-16 1978-03-16 Direct-current loop circuit

Country Status (1)

Country Link
JP (1) JPS54122011A (en)

Also Published As

Publication number Publication date
JPS5653910B2 (en) 1981-12-22

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