BATTERY POWER CIRCUIT FOR TELEPHONE INSTALLATION

摘要

THE INVENTION CONCERNS THE POWER SUPPLY CIRCUITS USED IN TELEPHONY. / P P THE CONTINUOUS CURRENT CIRCULATING IN EACH CONDUCTOR OF A BIFILAR TELECOMMUNICATIONS CHANNEL IS GENERATED BY A BIDIRECTIONAL CURRENT SOURCE 103, 104 WHICH RECEIVES THE ONE OF THE SIGNALS OF A COMPLEMENTARY PAIR OF FIRST SIGNALS OF