JPS56772A - Communication current supply circuit - Google Patents

Communication current supply circuit

Info

Publication number
JPS56772A
JPS56772A JP7610279A JP7610279A JPS56772A JP S56772 A JPS56772 A JP S56772A JP 7610279 A JP7610279 A JP 7610279A JP 7610279 A JP7610279 A JP 7610279A JP S56772 A JPS56772 A JP S56772A
Authority
JP
Japan
Prior art keywords
circuit
supply circuit
communication
current supply
communication current
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
JP7610279A
Other languages
Japanese (ja)
Inventor
Mamoru Senzai
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 JP7610279A priority Critical patent/JPS56772A/en
Publication of JPS56772A publication Critical patent/JPS56772A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To realize an economical circuit and to enable the amplification of the communication signal simply, by using a transistor circuit in place of a choke coil. CONSTITUTION:The resistors R1, R2, R1', R2', flowing the communication current are connected in series with the incoming and outgoing lines, and the bases of the transistors Q, Q' are connected to the communication line of the series circuit and the collectors are to the power supply circuit. The impedance viewed from the line is as shown in equation. Taking the resistors R1, R2 as 100 ohms and R4 as 10 ohms, the resultant resistance is 1.2 kohms, then the value is enough to block the communication signal.
JP7610279A 1979-06-16 1979-06-16 Communication current supply circuit Pending JPS56772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7610279A JPS56772A (en) 1979-06-16 1979-06-16 Communication current supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7610279A JPS56772A (en) 1979-06-16 1979-06-16 Communication current supply circuit

Publications (1)

Publication Number Publication Date
JPS56772A true JPS56772A (en) 1981-01-07

Family

ID=13595503

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7610279A Pending JPS56772A (en) 1979-06-16 1979-06-16 Communication current supply circuit

Country Status (1)

Country Link
JP (1) JPS56772A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195311U (en) * 1982-06-18 1983-12-26 明星電気株式会社 High impedance circuit for supplying call current
JPS6180243A (en) * 1984-09-28 1986-04-23 Shin Etsu Chem Co Ltd Negative type organosiloxane resist

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195311U (en) * 1982-06-18 1983-12-26 明星電気株式会社 High impedance circuit for supplying call current
JPH0413690Y2 (en) * 1982-06-18 1992-03-30
JPS6180243A (en) * 1984-09-28 1986-04-23 Shin Etsu Chem Co Ltd Negative type organosiloxane resist

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