Hookswitch bounce resistant telephone hold-mute circuit

Details Hookswitch bounce resistant telephone hold-mute circuit Hookswitch bounce resistant telephone hold-mute circuit

H - Electricity

04

M

379/73

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

Patent

CA 1221481

HOOKSWITCH BOUNCE RESISTANT TELEPHONE HOLD-MUTE CIRCUIT ABSTRACT OF THE DISCLOSURE A hold circuit for use with a single line telephone operable over long or short telephone loops. The included circuit during response to the momentary operation of a manual switch actuates a silicon con- trolled rectifier to place a resistive load across the telephone line thus allowing the subscriber at the telephone instrument to go "on-hook". Subsequent removal of the basic instrument handset from the hook- switch, or of a related extension telephone going "off- hook", will cause the resistive load to be removed.

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