com UTC1240A DESCRIPTION LI NEAR I NTEGRATED CI RCUI T ELECTRONIC DUAL-TONE RINGER The UTC1240A are monolithic integrated circuits designed to replace the mechanical bell in telephone sets in connection with an electro-acoustical converter.
Both devices can drive directly a piezoceramic converter (buzzer).
The output of UTC1240A needs a decoupling capacitor.
No current limitation is provided on the output stage of UTC1240A,so a minimum load DC of 50 ohms is adviced.
The two tone frequencies generated are switched by an internal oscillator in a fast sequence and made audible across an output amplifier in the loudspeaker,both tone frequencies and the switching frequency can b...

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