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telephone network wiring. The direct current required by the telephone's audio circuitry is blocked with a capacitor before entering the ringer to prevent the ringer from being triggered by circuit interruptions and pulse dialing. Typical ring signals ranged from 60 to over 100 Volts at a frequency of 20-30 Hertz.
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A ringer box consists of a case made of wood, metal, or plastic, containing bells or gongs and an electromagnetically-driven clapper which strikes the gongs when actuated. The electromagnet of the clapper responds to the alternating current sent from a central office exchange or another phone via the
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was the first widely used Bell System telephone to include the ringer and other subscriber set components inside the housing of the telephone set. Almost all telephones manufactured since have an
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Electric common battery subscriber set of c. 1930, containing a bell ringer, an induction coil, and a condenser, mounted underneath the wooden connecting board.
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Ringer boxes were produced by all manufacturers of customer-premises telephone equipment. In North
America, the prominent producers were
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Ringers were commonly placed in the same housing as the subscriber set, which consisted of other electrical components, such as
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The ringer contained in the ringer box alerts a call recipient to incoming calls by
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In telephony, ringer boxes and similar devices are often categorized as
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Electric hand telephone set of c. 1930 with its
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