GB1398860A - Operating circuit of a telephone set - Google Patents

Operating circuit of a telephone set

Info

Publication number
GB1398860A
GB1398860A GB3583473A GB3583473A GB1398860A GB 1398860 A GB1398860 A GB 1398860A GB 3583473 A GB3583473 A GB 3583473A GB 3583473 A GB3583473 A GB 3583473A GB 1398860 A GB1398860 A GB 1398860A
Authority
GB
United Kingdom
Prior art keywords
transistor
circuit
capacitor
impulsing
bridge
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
GB3583473A
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.)
TDK Micronas GmbH
ITT Inc
Original Assignee
Deutsche ITT Industries GmbH
ITT Industries Inc
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 Deutsche ITT Industries GmbH, ITT Industries Inc filed Critical Deutsche ITT Industries GmbH
Publication of GB1398860A publication Critical patent/GB1398860A/en
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
    • 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)
  • Interface Circuits In Exchanges (AREA)
GB3583473A 1972-08-03 1973-07-27 Operating circuit of a telephone set Expired GB1398860A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722238225 DE2238225A1 (de) 1972-08-03 1972-08-03 Betriebsschaltung eines telefonapparates

Publications (1)

Publication Number Publication Date
GB1398860A true GB1398860A (en) 1975-06-26

Family

ID=5852576

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3583473A Expired GB1398860A (en) 1972-08-03 1973-07-27 Operating circuit of a telephone set

Country Status (4)

Country Link
DE (1) DE2238225A1 (enrdf_load_stackoverflow)
ES (1) ES417510A1 (enrdf_load_stackoverflow)
FR (1) FR2195130B1 (enrdf_load_stackoverflow)
GB (1) GB1398860A (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2291656A1 (fr) * 1974-11-14 1976-06-11 Telic Clavier d'appel
IT1110111B (it) * 1979-01-12 1985-12-23 Acet Srl Impianto citofonico a portiere elettrico a due fili,suscettibile di utilizzare un pressistente impianto a campanello,senza necessita' di ulteriori linee di alimentazione
DE3408146A1 (de) * 1984-03-06 1985-09-12 Hagenuk GmbH, 2300 Kiel Schaltungsanordnung fuer eine fernsprechteilnehmerstation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849539A (en) * 1956-12-13 1958-08-26 Bell Telephone Labor Inc Magnetic core circuits
DE1145233B (de) * 1960-10-04 1963-03-14 Arnstadt Fernmeldewerk Stromstosssender, insbesondere Nummern-schalter fuer Fernsprechapparate
DE1229154B (de) * 1965-04-30 1966-11-24 Maack Elmewe Schaltungsanordnung fuer Gebuehrenzaehler in Fernsprechteilnehmerstationen
US3488450A (en) * 1966-12-02 1970-01-06 American Telephone & Telegraph Sender for transmitting trains of pulses
CH491562A (de) * 1969-10-14 1970-05-31 Autophon Ag Schaltungsanordnung für Telephonteilnehmerstationen mit einer Einrichtung zur Abgabe von Tonfrequenz-Wahlsignalen
DE2043611A1 (de) * 1970-09-03 1972-03-09 Tn Ladeschaltung für Kondensatoren am Ende einer, nur geringe Leistung über tragenden Leitung in Fernmeldeanlagen
BE788732A (fr) * 1971-09-13 1973-03-13 Int Standard Electric Corp Poste telephonique a clavier
CH537679A (de) * 1971-10-29 1973-05-31 Sodeco Compteurs De Geneve Einrichtung zum Speisen von Zusatzgeräten bei Telephonsprechstellen

Also Published As

Publication number Publication date
DE2238225A1 (de) 1974-02-14
ES417510A1 (es) 1976-03-01
FR2195130B1 (enrdf_load_stackoverflow) 1976-11-12
FR2195130A1 (enrdf_load_stackoverflow) 1974-03-01

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee