Automatic power breaking circuits for communication equipments

Details Automatic power breaking circuits for communication equipments Automatic power breaking circuits for communication equipments

1991-10-22

1993-08-03

Kuntz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

455343, H04M 1100, H04B 116

Patent

active

052336450

ABSTRACT:
An automatic power breaking circuit for a communication equipment, for breaking automatically electric power in the communication equipment when the communication equipment does not perform transmission and reception for talk. The present circuit comprises a call processing tone detector 1 connected to a receiving stage of the communication equipment, for detecting a plurality of predetermined tones provided from a switch board of an exchange, a JK flip-flop 2 connected to said call processing tone detector 1, for receiving a source voltage, a talk terminal 4 for receiving said source voltage and being manually switched to an ON state by the user when transmission or reception is required, a D flip-flop 6 connected to said talk terminal 4, an AND gate 7 connected to output terminals of said JK flip-flop 2 and D flip-flop 6, and a transistor 8 connected to an output terminal of said AND gate 7w for switching power being supplied to a transmitting stage of the communication equipment. In accordance with the present invention, an unnecessary loss of the electric power in the communication equipment can be prevented, so that the life span of a charging battery contained therein and the portable communication period of time can be lengthened, and the power supply can be miniaturized.

REFERENCES:
patent: 4086429 (1978-04-01), Kotezawa et al.
patent: 4731814 (1988-03-01), Becker et al.
patent: 5031231 (1991-07-01), Miyazaki
patent: 5142563 (1992-08-01), Nyuu et al.

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