JPS564971A - Data/electric-power separator - Google Patents

Data/electric-power separator

Info

Publication number
JPS564971A
JPS564971A JP8018679A JP8018679A JPS564971A JP S564971 A JPS564971 A JP S564971A JP 8018679 A JP8018679 A JP 8018679A JP 8018679 A JP8018679 A JP 8018679A JP S564971 A JPS564971 A JP S564971A
Authority
JP
Japan
Prior art keywords
electric
constant
circuit
terminal
power
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
JP8018679A
Other languages
Japanese (ja)
Inventor
Ryoichi Abe
Akihisa Ueda
Ryoichi Uchiyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8018679A priority Critical patent/JPS564971A/en
Publication of JPS564971A publication Critical patent/JPS564971A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To prevent a data signal from mixing in an electric power source for terminal drive while reducing the manufacture cost of a data/electric-power separating circuit, by using as an electric-power separating circuit a low-cost constant- current circuit consisting principally of a transistor. CONSTITUTION:Electric-power separating circuit 4' has input terminal 4'-1 and output terminal 4'-2, which are connected to input terminal 2-1 of a terminal and input terminal 5-2 of DC electric power load circuit 5-5. Then, electric-power separating circuit 4' is composed of constant-current circuit 6 consisting of Zener diode 6-1, biasing resistance 6-2 and transistor 6-3. Using this constant-current circuit 6 can obtain a direct current needed to drive terminal equipment 5 without using any coil and further supplying the output of constant-current circuit 6 to constant-voltage diode 7 can obtain a constant voltage for driving terminal equipment 5.
JP8018679A 1979-06-27 1979-06-27 Data/electric-power separator Pending JPS564971A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8018679A JPS564971A (en) 1979-06-27 1979-06-27 Data/electric-power separator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8018679A JPS564971A (en) 1979-06-27 1979-06-27 Data/electric-power separator

Publications (1)

Publication Number Publication Date
JPS564971A true JPS564971A (en) 1981-01-19

Family

ID=13711330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8018679A Pending JPS564971A (en) 1979-06-27 1979-06-27 Data/electric-power separator

Country Status (1)

Country Link
JP (1) JPS564971A (en)

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