Ringer Capacitor

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The 1.9-mf capacitor in Telephone EE-8, or the 2.0-mf capacitor in Telephones EE-8-A and EE-8-B, is in series with the ringer when the screw switch is in the CB position. This capacitor prevents direct current from biasing the ringer and also pre­ vents the ringer from interfering with d-c signaling or supervision when the telephone is connected to a common battery system. The capacitor is short-circuited when the screw switch is turned to the LB position.

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The transmission loss through the ringer, or the ringer and the capacitor in series, and the holding coil is negligible because of the high impedance to voice-frequency currents of these elements.