JPS641989B2 - - Google Patents

Info

Publication number
JPS641989B2
JPS641989B2 JP8127582A JP8127582A JPS641989B2 JP S641989 B2 JPS641989 B2 JP S641989B2 JP 8127582 A JP8127582 A JP 8127582A JP 8127582 A JP8127582 A JP 8127582A JP S641989 B2 JPS641989 B2 JP S641989B2
Authority
JP
Japan
Prior art keywords
piezoelectric sounder
terminal
amplifier
circuit
capacitor
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
JP8127582A
Other languages
English (en)
Japanese (ja)
Other versions
JPS58197946A (ja
Inventor
Shinji Nishimura
Yutaka Nishino
Yutaka Ichinose
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP8127582A priority Critical patent/JPS58197946A/ja
Publication of JPS58197946A publication Critical patent/JPS58197946A/ja
Publication of JPS641989B2 publication Critical patent/JPS641989B2/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)
JP8127582A 1982-05-14 1982-05-14 電話機用ト−ンリンガ回路 Granted JPS58197946A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8127582A JPS58197946A (ja) 1982-05-14 1982-05-14 電話機用ト−ンリンガ回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8127582A JPS58197946A (ja) 1982-05-14 1982-05-14 電話機用ト−ンリンガ回路

Publications (2)

Publication Number Publication Date
JPS58197946A JPS58197946A (ja) 1983-11-17
JPS641989B2 true JPS641989B2 (en]) 1989-01-13

Family

ID=13741812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8127582A Granted JPS58197946A (ja) 1982-05-14 1982-05-14 電話機用ト−ンリンガ回路

Country Status (1)

Country Link
JP (1) JPS58197946A (en])

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA968477A (en) * 1972-07-24 1975-05-27 Microsystems International Limited Threshold circuit for tone-ringer or like load means
JPS549902Y2 (en]) * 1975-08-20 1979-05-09
JPS56162799A (en) * 1980-05-19 1981-12-14 Nippon Telegraph & Telephone Self-exciting type piezoelectric sounding circuit

Also Published As

Publication number Publication date
JPS58197946A (ja) 1983-11-17

Similar Documents

Publication Publication Date Title
US2850650A (en) Transistor current limiter
US4658419A (en) Telephone ringer circuit
JPS596549B2 (ja) 電話機用３端子電源回路
JPS641989B2 (en])
US4135062A (en) Electric network for use in a subscriber's loop
US4263644A (en) Current limiter for switched DC-to-DC converter
JPS6085605A (ja) 発振器回路
US4550226A (en) Subscriber's telephone circuit arranged to present constant impedance to a telephone line
US3210479A (en) Voice-frequency selective signalling arrangement
US3218395A (en) Electronic signaling arrangement
US3440351A (en) Telephone transmitter circuit employing variable capacitance microphone
JPH0618396B2 (ja) 電話機用電源回路
EP0026540B1 (en) Voltage stabiliser suitable for use in a telephone set
US3440352A (en) Piezoresistance element microphone circuit
US4000379A (en) Tone generator
US3761642A (en) Touch-calling tone generator
US5442695A (en) Ringer circuit
JP2994844B2 (ja) 伝送入出力回路
JPH0317496Y2 (en])
JPS61139149A (ja) ト−ンリンガ回路
US3815050A (en) Temperature stable tone generator
JP2524251B2 (ja) 音声用真空管増幅回路
JP2608574B2 (ja) 回線制御回路
US6169800B1 (en) Integrated circuit amplifier and method of adaptive offset
CA1209291A (en) Subscriber's telephone circuit