JPS56164657A - Circuit for telephone set - Google Patents

Circuit for telephone set

Info

Publication number
JPS56164657A
JPS56164657A JP6643080A JP6643080A JPS56164657A JP S56164657 A JPS56164657 A JP S56164657A JP 6643080 A JP6643080 A JP 6643080A JP 6643080 A JP6643080 A JP 6643080A JP S56164657 A JPS56164657 A JP S56164657A
Authority
JP
Japan
Prior art keywords
circuit
impedance
channel
zener diode
equivalently
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
JP6643080A
Other languages
Japanese (ja)
Other versions
JPS6316060B2 (en
Inventor
Eiji Morikami
Takeo Oba
Hirozo Shintani
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP6643080A priority Critical patent/JPS56164657A/en
Publication of JPS56164657A publication Critical patent/JPS56164657A/en
Publication of JPS6316060B2 publication Critical patent/JPS6316060B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To always keep a channel terminal impedance to a given value, by inserting an impedance circuit having equal impedance to a channel circuit equivalently to the channel terminal according to the power supplied. CONSTITUTION:During call, a channel circuit is connected to a separation and pickup circuit 4 with a hook switch 5 to prevent the mixing of an information signal to the channel circuit 6 with a given filtering characteristic. In this case, a Zener diode of an impedance circuit 11 is nonconductive. On the other hand, in case of noncommunication, since a hook switch 5 is turned off, a channel terminal voltage is increased, the Zener diode of the impedance circuit 11 is made conductive, and an impedance equivalently equal to that of the channel 6 is resulted to have been connected as a load impedance of the circuit 4.
JP6643080A 1980-05-21 1980-05-21 Circuit for telephone set Granted JPS56164657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6643080A JPS56164657A (en) 1980-05-21 1980-05-21 Circuit for telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6643080A JPS56164657A (en) 1980-05-21 1980-05-21 Circuit for telephone set

Publications (2)

Publication Number Publication Date
JPS56164657A true JPS56164657A (en) 1981-12-17
JPS6316060B2 JPS6316060B2 (en) 1988-04-07

Family

ID=13315549

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6643080A Granted JPS56164657A (en) 1980-05-21 1980-05-21 Circuit for telephone set

Country Status (1)

Country Link
JP (1) JPS56164657A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5763978A (en) * 1995-04-20 1998-06-09 Fanuc Ltd. Insulating member for a core of a motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5763978A (en) * 1995-04-20 1998-06-09 Fanuc Ltd. Insulating member for a core of a motor

Also Published As

Publication number Publication date
JPS6316060B2 (en) 1988-04-07

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