U4076B - Three-Tone Ringer for Telephone Sets
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 operating the IC with the dc supply voltage, being d
U4076B Features
* 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 between 2.5 Hz and 25 Hz D Input protective diode D On-chip rectifier bridge D Protection circuit against ringing in a parallel circui
