JPS57190449A - Driver for telephone calling sounder - Google Patents

Driver for telephone calling sounder

Info

Publication number
JPS57190449A
JPS57190449A JP7492481A JP7492481A JPS57190449A JP S57190449 A JPS57190449 A JP S57190449A JP 7492481 A JP7492481 A JP 7492481A JP 7492481 A JP7492481 A JP 7492481A JP S57190449 A JPS57190449 A JP S57190449A
Authority
JP
Japan
Prior art keywords
trs
sounder
voltage
driver
constant
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
JP7492481A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0136295B2 (enrdf_load_stackoverflow
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 true JPS57190449A (en) 1982-11-24
JPH0136295B2 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595797A (en) * 1983-07-22 1986-06-17 Thomson-Csf Telephone Ringing signal generator for a subscriber telephone set

Citations (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

Patent Citations (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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595797A (en) * 1983-07-22 1986-06-17 Thomson-Csf Telephone Ringing signal generator for a subscriber telephone set

Also Published As

Publication number Publication date
JPH0136295B2 (enrdf_load_stackoverflow) 1989-07-31

Similar Documents

Publication Publication Date Title
JPS5753112A (en) Sepp power amplifier
JPS57190449A (en) Driver for telephone calling sounder
JPS6431258A (en) Microprocessor
JPS6439117A (en) Emitter-coupled logic circuit
JPS5422812A (en) Feedback amplifying circuit with fet switch circuit
JPS5671344A (en) Car telephone with speaker
GB1524107A (en) Circuit arrangement for an acoustic generator
JPS5510204A (en) Change-over switch circuit
EP0181752A3 (en) Extended range amplifier circuit
JPS56107647A (en) Switch circuit
JPS55166317A (en) Electric power amplifier
KR970010255B1 (en) Speaker for high and low frequency
JPS51128208A (en) Idling power saving
JPS5755603A (en) Power amplifier
JPS56164657A (en) Circuit for telephone set
JPS52106616A (en) Terminal call
JPS52105813A (en) Magnetic circuit for speaker
JPS5245808A (en) Switchboard telephone circuit
JPS6473827A (en) Digital-analog conversion circuit
JPS5345569A (en) Electronic watch
JPS57188115A (en) Complementary fet push-pull circuit
JPS5723306A (en) Amplifying circuit
JPS56160111A (en) Amplifier of pulse duration modulated signal
JPS5739606A (en) Amplifying circuit of pulse width modulation
JPS533760A (en) Viriable active group delay equalizer