Telephonic communications – Call signal generating
Patent
1987-03-10
1988-04-12
Schreyer, Stafford D.
Telephonic communications
Call signal generating
H04M 302
Patent
active
047379898
ABSTRACT:
The invention concerns an electronic ringing circuit for telephone systems. A capacitor is connected to the center tapping of a first coil inductively coupled to a transistor-controlled supply line. The other side of the capacitor is connected to the junction between two switches each switch being connected via an induction coil to one end of the first coil so that when the switches are switched in opposite senses load current is drawn in alternate directions from the capacitor.
REFERENCES:
patent: 3904833 (1975-09-01), Beene
patent: 4354062 (1982-10-01), Mussman
Cross Peter A.
Robson Michael A. C.
Schreyer Stafford D.
The General Electric Company p.l.c.
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