Electronic hold circuit

Details Electronic hold circuit Electronic hold circuit

H - Electricity

04

M

379/73

H04M 1/00 (2006.01) H04M 1/80 (2006.01) H04M 3/428 (2006.01)

Patent

CA 1205230

IMPROVED ELECTRONIC HOLD CIRCUIT ABSTRACT OF THE DISCLOSURE In a hold circuit connectable to a subscriber telephone line, a silicon controlled rectifier is turned on by a user operated momentary pushbutton connecting the positive side of the line to the hold circuit. A comparator circuit sensing the initial value of the loop voltage, turns on a transistor and connects a line seizing network across the subscriber line.

439992

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