Surge protected electronic switch for telephone voiceband...

Details Surge protected electronic switch for telephone voiceband... Surge protected electronic switch for telephone voiceband...

H - Electricity

04

M

323/6, 379/66

H04M 7/00 (2006.01) H04M 1/31 (2006.01) H04M 1/74 (2006.01)

Patent

CA 1245384

TITLE A SURGE PROTECTED ELECTRONIC SWITCH FOR TELEPHONE VOICEBAND CIRCUITS ABSTRACT OF THE DISCLOSURE A fast response electronic switch used for control of connect and disconnect functions, primarily related to speech network applications for electronic- microprocessor based telephones utilizing dual tone multifrequency and/or universal pulse dial address signaling. Disclosed circuitry includes an active surge protector, a saturated transistor switch and bias circuit which exhibits a high AC impedance with respect to the telephone subscriber line.

500683

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