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ES417537A1 - Mejoras en los circuitos de llamada por pulsador para apa- ratos telefonicos. - Google Patents

Mejoras en los circuitos de llamada por pulsador para apa- ratos telefonicos.

Info

Publication number
ES417537A1
ES417537A1 ES417537A ES417537A ES417537A1 ES 417537 A1 ES417537 A1 ES 417537A1 ES 417537 A ES417537 A ES 417537A ES 417537 A ES417537 A ES 417537A ES 417537 A1 ES417537 A1 ES 417537A1
Authority
ES
Spain
Prior art keywords
transistor
thyristor
circuit
transistors
resistance
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
ES417537A
Other languages
English (en)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Priority to ES417537A priority Critical patent/ES417537A1/es
Priority to AU71770/74A priority patent/AU490662B2/en
Priority to GB3357774A priority patent/GB1440542A/en
Priority to FR7426888A priority patent/FR2239828B1/fr
Publication of ES417537A1 publication Critical patent/ES417537A1/es
Expired 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
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
ES417537A 1973-08-03 1973-08-03 Mejoras en los circuitos de llamada por pulsador para apa- ratos telefonicos. Expired ES417537A1 (es)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES417537A ES417537A1 (es) 1973-08-03 1973-08-03 Mejoras en los circuitos de llamada por pulsador para apa- ratos telefonicos.
AU71770/74A AU490662B2 (en) 1973-08-03 1974-07-29 Improvements in pushbutton calling circuits for telephone sets
GB3357774A GB1440542A (en) 1973-08-03 1974-07-30 Push-button calling circuits for telephone sets
FR7426888A FR2239828B1 (es) 1973-08-03 1974-08-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES417537A ES417537A1 (es) 1973-08-03 1973-08-03 Mejoras en los circuitos de llamada por pulsador para apa- ratos telefonicos.

Publications (1)

Publication Number Publication Date
ES417537A1 true ES417537A1 (es) 1976-03-01

Family

ID=8464781

Family Applications (1)

Application Number Title Priority Date Filing Date
ES417537A Expired ES417537A1 (es) 1973-08-03 1973-08-03 Mejoras en los circuitos de llamada por pulsador para apa- ratos telefonicos.

Country Status (3)

Country Link
ES (1) ES417537A1 (es)
FR (1) FR2239828B1 (es)
GB (1) GB1440542A (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541903C3 (de) * 1975-09-19 1979-09-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung für über ihre AnschluBleitiuigen gespeiste Teilnehmerstationen mit Impulstastwahl in Fernmelde-, insbesondere Fernsprechanlagen
EP0027302A1 (en) * 1979-10-10 1981-04-22 Suchi Chiou Interface circuits for touch-pulse telephones
FR2505586A1 (fr) * 1981-05-05 1982-11-12 Thomson Csf Mat Tel Poste telephonique a clavier
FR2508744A1 (fr) * 1981-06-26 1982-12-31 Thomson Csf Mat Tel Poste telephonique a clavier et a ecoute amplifiee

Also Published As

Publication number Publication date
FR2239828A1 (es) 1975-02-28
AU7177074A (en) 1976-01-29
GB1440542A (en) 1976-06-23
FR2239828B1 (es) 1978-02-17

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