Circuit for preventing impulse generation by operating a hook sw

Details Circuit for preventing impulse generation by operating a hook sw Circuit for preventing impulse generation by operating a hook sw

1974-12-18

1976-07-13

Robinson, Thomas A.

179 81R, 04M 174, H04M 174

Patent

active

039695913

ABSTRACT:
A circuit for preventing impulse generation caused by operating a hook switch in a telephone set, in which the hook switch has a make contact and a break contact which are make-before-break contacts in going to the OFF-hook condition, and are break-after-make contacts in going to the ON-hook condition. A capacitor is charged through the make contact when it is closed in the OFF-hook condition. A transistor switching circuit is provided to turn ON by the charge on the capacitor so as to short-circuit between telephone line terminals of the telephone set when the break contact is closed in the ON-hook condition.

REFERENCES:
patent: 3471650 (1969-10-01), Birck
patent: 3525819 (1970-08-01), Jackson

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