CA1072694A - Circuit de commande electronique de sonnerie a tonalite pour appareil telephonique - Google Patents

Circuit de commande electronique de sonnerie a tonalite pour appareil telephonique

Info

Publication number
CA1072694A
CA1072694A CA288,023A CA288023A CA1072694A CA 1072694 A CA1072694 A CA 1072694A CA 288023 A CA288023 A CA 288023A CA 1072694 A CA1072694 A CA 1072694A
Authority
CA
Canada
Prior art keywords
transistor
circuit
capacitor
voltage
supply voltage
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
CA288,023A
Other languages
English (en)
Inventor
Edward L. Henderson
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Priority to CA288,023A priority Critical patent/CA1072694A/fr
Application granted granted Critical
Publication of CA1072694A publication Critical patent/CA1072694A/fr
Expired legal-status Critical Current

Links

Landscapes

  • Devices For Supply Of Signal Current (AREA)
CA288,023A 1977-10-03 1977-10-03 Circuit de commande electronique de sonnerie a tonalite pour appareil telephonique Expired CA1072694A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA288,023A CA1072694A (fr) 1977-10-03 1977-10-03 Circuit de commande electronique de sonnerie a tonalite pour appareil telephonique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA288,023A CA1072694A (fr) 1977-10-03 1977-10-03 Circuit de commande electronique de sonnerie a tonalite pour appareil telephonique

Publications (1)

Publication Number Publication Date
CA1072694A true CA1072694A (fr) 1980-02-26

Family

ID=4109694

Family Applications (1)

Application Number Title Priority Date Filing Date
CA288,023A Expired CA1072694A (fr) 1977-10-03 1977-10-03 Circuit de commande electronique de sonnerie a tonalite pour appareil telephonique

Country Status (1)

Country Link
CA (1) CA1072694A (fr)

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Legal Events

Date Code Title Description
MKEX Expiry