JPS5531321A - Current supply circuit - Google Patents

Current supply circuit

Info

Publication number
JPS5531321A
JPS5531321A JP10445378A JP10445378A JPS5531321A JP S5531321 A JPS5531321 A JP S5531321A JP 10445378 A JP10445378 A JP 10445378A JP 10445378 A JP10445378 A JP 10445378A JP S5531321 A JPS5531321 A JP S5531321A
Authority
JP
Japan
Prior art keywords
circuit
transistor
subscriber
current supply
supply circuit
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
JP10445378A
Other languages
Japanese (ja)
Inventor
Takehiko Tsutsumi
Takeshi Sanbe
Junji Asakura
Shige Miyoshi
Michio Takahashi
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.)
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
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 Fujitsu Ltd, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP10445378A priority Critical patent/JPS5531321A/en
Publication of JPS5531321A publication Critical patent/JPS5531321A/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 simplify the current supply circuit of the subscriber circuit which supplies the DC to the subscriber terminal via the subscriber line or to the trunk circuit of the opposing exchange via the main wire, thus facilitating the holding and maintenance of the function as well as realizing the cost reduction. CONSTITUTION:The circuits which are formed symmetrically to each other with the complementary transistors Q1 and Q2 which are biased by the resistance circuit are connected between one side of the double-wire structure and the earth as well as between the other side and power source E1. And complementary transistors Q3 and Q4 are connected between the base and the collector of Q1 and Q2 each, and also one unit of transistor Q11 is connected between the bases of Q3 and Q4. Then the high-level signal is supplied to control signal input terminal T3, and the DC current is supplied to load L1. The photo coupling transistor can be used in place of transistor Q11.
JP10445378A 1978-08-29 1978-08-29 Current supply circuit Pending JPS5531321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10445378A JPS5531321A (en) 1978-08-29 1978-08-29 Current supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10445378A JPS5531321A (en) 1978-08-29 1978-08-29 Current supply circuit

Publications (1)

Publication Number Publication Date
JPS5531321A true JPS5531321A (en) 1980-03-05

Family

ID=14381030

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10445378A Pending JPS5531321A (en) 1978-08-29 1978-08-29 Current supply circuit

Country Status (1)

Country Link
JP (1) JPS5531321A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61138771U (en) * 1985-02-20 1986-08-28
JPS6281868A (en) * 1985-10-05 1987-04-15 Fujitsu Ltd Current loop forming circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5217759A (en) * 1975-07-31 1977-02-09 Hitachi Ltd Semi-conductor switch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5217759A (en) * 1975-07-31 1977-02-09 Hitachi Ltd Semi-conductor switch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61138771U (en) * 1985-02-20 1986-08-28
JPH0323421Y2 (en) * 1985-02-20 1991-05-22
JPS6281868A (en) * 1985-10-05 1987-04-15 Fujitsu Ltd Current loop forming circuit
JPH0736587B2 (en) * 1985-10-05 1995-04-19 富士通株式会社 Current loop forming circuit

Similar Documents

Publication Publication Date Title
GB782780A (en) Improvements in or relating to electronic switches employing junction transistors
JPS5531321A (en) Current supply circuit
ES470362A1 (en) Bipolar transistor switching network crosspoint
JPS55154866A (en) Current supply circuit for telephone switchboard
JPS56117469A (en) Control system for current supply circuit
JPS5535574A (en) Logic device
JPS54105441A (en) Exclusive-logical sum circuit
JPS54139369A (en) Two-way semiconductor switch
JPS56772A (en) Communication current supply circuit
JPS6482385A (en) Semiconductor storage device
JPS57188133A (en) Transistor relay circuit
JPS5556754A (en) Current supply circuit
JPS5487160A (en) Logic circuit
JPS5623030A (en) Reference voltage generating circuit for cml circuit
JPS5522806A (en) Semiconductor circuit
SU559363A1 (en) Amplifier
JPS55154868A (en) Current supply circuit for telephone switchboard
JPS5558628A (en) Driving circuit
JPS57142012A (en) Transistor circuit
JPS55121716A (en) Amplification circuit
JPS5742215A (en) Impedance conversion circuit
JPS56164616A (en) Impedance converting circuit
IE41644L (en) Power supply circuits
JPS5753152A (en) Inverter circuit
GB1065550A (en) Transistor switching circuit