GB916040A - Electric signal generators - Google Patents

Electric signal generators

Info

Publication number
GB916040A
GB916040A GB3651560A GB3651560A GB916040A GB 916040 A GB916040 A GB 916040A GB 3651560 A GB3651560 A GB 3651560A GB 3651560 A GB3651560 A GB 3651560A GB 916040 A GB916040 A GB 916040A
Authority
GB
United Kingdom
Prior art keywords
transformer
transistors
diodes
static switch
electric signal
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
GB3651560A
Inventor
John William Westwood
Robert Noel Hanna
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.)
Ericsson Telephones Ltd
Original Assignee
Ericsson Telephones Ltd
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 Ericsson Telephones Ltd filed Critical Ericsson Telephones Ltd
Priority to GB3651560A priority Critical patent/GB916040A/en
Publication of GB916040A publication Critical patent/GB916040A/en
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

916,040. Transistor gating circuits. ERICSSON TELEPHONES Ltd. July 31, 1961 [Oct. 25, 1960], No. 36515/60. Class 40 (6). [Also in Group XXXIX] In order to produce a number of characteristic tones for use in a telephone exchange a common frequency generator 1 feeds the primaries of a number of transformers 3, the feed to each transformer being interrupted by a static switch according to the pattern which characterises the tone supplied by that transformer. A suitable form of static switch comprises transistors 21, 22, which respectively gate the positive and negative half-cycles delivered by generator 1 to the transformer 3. By switching the transistors together the transformer may be disconnected to interrupt the transformer output. Diodes 4 and 5 limit leakage current through the transistors while diodes 6 and 7 limit the voltage applied to the transistors.
GB3651560A 1960-10-25 1960-10-25 Electric signal generators Expired GB916040A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3651560A GB916040A (en) 1960-10-25 1960-10-25 Electric signal generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3651560A GB916040A (en) 1960-10-25 1960-10-25 Electric signal generators

Publications (1)

Publication Number Publication Date
GB916040A true GB916040A (en) 1963-01-16

Family

ID=10388869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3651560A Expired GB916040A (en) 1960-10-25 1960-10-25 Electric signal generators

Country Status (1)

Country Link
GB (1) GB916040A (en)

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