GB1469103A - Circuit arrangements in telephone apparatus - Google Patents

Circuit arrangements in telephone apparatus

Info

Publication number
GB1469103A
GB1469103A GB1718373A GB1718373A GB1469103A GB 1469103 A GB1469103 A GB 1469103A GB 1718373 A GB1718373 A GB 1718373A GB 1718373 A GB1718373 A GB 1718373A GB 1469103 A GB1469103 A GB 1469103A
Authority
GB
United Kingdom
Prior art keywords
capacitor
diodes
april
pair
telephone apparatus
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
GB1718373A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB1718373A priority Critical patent/GB1469103A/en
Priority to AU67685/74A priority patent/AU480096B2/en
Priority to US05/459,860 priority patent/US3956596A/en
Priority to ZA00742307A priority patent/ZA742307B/en
Publication of GB1469103A publication Critical patent/GB1469103A/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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1469103 Automatic exchange systems GENERAL ELECTRIC CO Ltd 8 April 1974 [10 April 1973 22 June 1973] 17183/73 and 29781/73 Heading H4K In a subscribers telephone set of a type which includes a capacitor for powering an impulse transmitter during line breaks caused by dialling, a rectifier bridge for charging the capacitor comprises a pair of diodes 501, 502 and a pair of transistors 521, 522. The diodes 501, 502 are preferably Zener diodes. The capacitor (not shown) may be connected across terminals +, - either directly or via a charging circuit.
GB1718373A 1973-04-10 1973-04-10 Circuit arrangements in telephone apparatus Expired GB1469103A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB1718373A GB1469103A (en) 1973-04-10 1973-04-10 Circuit arrangements in telephone apparatus
AU67685/74A AU480096B2 (en) 1973-04-10 1974-04-09 Circuit arrangements in telephone apparatus
US05/459,860 US3956596A (en) 1973-04-10 1974-04-10 Circuit arrangements in telephone apparatus
ZA00742307A ZA742307B (en) 1973-04-10 1974-04-10 Improvements in or relating to circuit arrangements in telephone apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1718373A GB1469103A (en) 1973-04-10 1973-04-10 Circuit arrangements in telephone apparatus

Publications (1)

Publication Number Publication Date
GB1469103A true GB1469103A (en) 1977-03-30

Family

ID=10090723

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1718373A Expired GB1469103A (en) 1973-04-10 1973-04-10 Circuit arrangements in telephone apparatus

Country Status (2)

Country Link
GB (1) GB1469103A (en)
ZA (1) ZA742307B (en)

Also Published As

Publication number Publication date
ZA742307B (en) 1975-03-26

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee