Electric source circuit for telephone sets

Details Electric source circuit for telephone sets Electric source circuit for telephone sets

H - Electricity

04

M

379/63

H04M 19/00 (2006.01) H04M 19/08 (2006.01)

Patent

CA 1223994

ABSTRACT OF THE DISCLOSURE An output voltage of a first diode deriving out an office line voltage, and an output voltage of a second diode deriving out the voltage of a back-up battery are combined and then smoothed by a smoothing capacitor. The smoothed voltage is supplied to a control circuit. A voltage limiting circuit is connected to the input side of the first limiter for limiting the upper limit of the smoothed voltage. A switch circuit is provided which is rendered conductive at the time of talking and the at the time of sending out a dial pulse for combining the office line voltage with the combined voltage. A voltage limiting circuit is also provided which is enabled only at the time of talking and at the time of sending out a dial pulse for limiting the upper limit of the combined voltage.

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