JPH0136295B2 - - Google Patents

Info

Publication number
JPH0136295B2
JPH0136295B2 JP56074924A JP7492481A JPH0136295B2 JP H0136295 B2 JPH0136295 B2 JP H0136295B2 JP 56074924 A JP56074924 A JP 56074924A JP 7492481 A JP7492481 A JP 7492481A JP H0136295 B2 JPH0136295 B2 JP H0136295B2
Authority
JP
Japan
Prior art keywords
circuit
output
constant current
sounder
transistor switch
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.)
Expired
Application number
JP56074924A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57190449A (en
Inventor
Masahiro Osajima
Masami Tokuda
Shinji Nishimura
Makoto Yoshitoshi
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
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
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, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP7492481A priority Critical patent/JPS57190449A/ja
Publication of JPS57190449A publication Critical patent/JPS57190449A/ja
Publication of JPH0136295B2 publication Critical patent/JPH0136295B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
JP7492481A 1981-05-20 1981-05-20 Driver for telephone calling sounder Granted JPS57190449A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7492481A JPS57190449A (en) 1981-05-20 1981-05-20 Driver for telephone calling sounder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7492481A JPS57190449A (en) 1981-05-20 1981-05-20 Driver for telephone calling sounder

Publications (2)

Publication Number Publication Date
JPS57190449A JPS57190449A (en) 1982-11-24
JPH0136295B2 true JPH0136295B2 (enrdf_load_stackoverflow) 1989-07-31

Family

ID=13561395

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7492481A Granted JPS57190449A (en) 1981-05-20 1981-05-20 Driver for telephone calling sounder

Country Status (1)

Country Link
JP (1) JPS57190449A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2549668B1 (fr) * 1983-07-22 1985-10-04 Thomson Csf Mat Tel Circuit injecteur de sonnerie pour poste telephonique d'abonne

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS522308A (en) * 1975-06-24 1977-01-10 Iwatsu Electric Co Ltd Tone ringer circuit

Also Published As

Publication number Publication date
JPS57190449A (en) 1982-11-24

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