three-tone ringer for telephone sets.
D Three-tone ringing sequence with 800 Hz, 1067 Hz
and 1333 Hz
D Clock oscillator with ceramic resonator or LC series
cct possible
D Sequence frequency adjustable betwe.
All operating parameters must be.
The three-tone ringing integrated circuit U4076B, in conjunction with a piezo transducer or loudspeaker replaces the normal electromechanical telephone bell. It is operated with the ringing current from the exchange. There is also a possibility of op.
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