Electronic hold release circuit

Details Electronic hold release circuit Electronic hold release circuit

H - Electricity

04

M

379/73

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

Patent

CA 1205229

IMPROVED ELECTRONIC HOLD RELEASE CIRCUIT ABSTRACT OF THE DISCLOSURE In a hold circuit including a silicon con- trolled rectifier (SCR) normally turned on and con- necting the hold circuit to a subscriber line, a first hold release circuit outputs a trigger signal to a transistor turning off the transistor and disconnecting a line seizing network. A second hold release circuit outputs a trigger signal to a second transistor re- sponsive to the line seizing network being discon- nected. The second transistor connects a load re- sistor across the SCR dropping the holding current flowing through the SCR causing it to turn off. The second hold release circuit is also arranged to output its trigger signal to the second transistor responsive to a pre-arranged timing interval.

439972

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