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Common-Battery Telephone SetsIn the common-battery telephone system, one battery at the central office supplies the direct current to all transmitters in use at a given time; hence, the term common battery. The historyref.3 of this type of set is of interest, many circuits, some of questionable merit, having been developed.ref.2,3,4,5 Common-battery telephone circuits may be classified as sidetone circuits or as antisidetone circuits. With the first type, considerable energy is transferred from the transmitter to the receiver, and thus a sound actuating the transmitter is plainly heard in the associated receiver as sidetone. The antisidetone circuit greatly reduces this effect.
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Last Update: 2011-05-30