Bell signal generating circuit

Details Bell signal generating circuit Bell signal generating circuit

H - Electricity

04

M

H04M 1/00 (2006.01) H04M 3/02 (2006.01) H04M 19/04 (2006.01)

Patent

CA 2104406

A bell signal generating circuit for a key telephone set. A dc component of a pulse signal is removed by a photo-coupler to generate a first signal. A high frequency component of the first signal is removed by a filter to generate a second signal. A differential amplifier amplifies the second signal to generate a bell signal. To the differential amplifier, a dc supply voltage based on the dc signal in synchronism with the pulse signal is applied.

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