RINGING CIRCUIT

摘要

Ringing Circuit The invention concerns an electronic ringing circuit for telephone systems. A capacitor is connected to the centre 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.