Transient resistant key operated pulse generating calling...

Details Transient resistant key operated pulse generating calling... Transient resistant key operated pulse generating calling...

H - Electricity

04

M

379/26

H04M 1/31 (2006.01)

Patent

CA 1223992

TRANSIENT RESISTANT KEY OPERATED PULSE GENERATING KILLING DEVICE CIRCUIT ABSTRACT OF THE INVENTION A protective circuit consisting of two diodes which functions along with other external circuit ele- mints to provide protection against transients for an integrated circuit utilized to generate dial pulses in an electronic telephone circuit. By means of included diodes, excessive transients are prevented from enter- in the integrated circuit internal circuitry and disturbing the memory included therein or other opera- tonal characteristics.

469337

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