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The device is designed for use with either a piezo transducer or an inexpensive transformer coupled speaker to produce a pleasing tone composed of a high frequency fR alternating with a low frequency fL resulting in a warble frequency. The supply voltage is ob.

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The supplyvoltage is obtained from the AC ring signal and the circuit is designedso that noise on the line or variation of the ringing signal can notaffect correct operation of the device. Functional operation should be restricted to the Recommended Operating Conditions. However, precautions must be taken to avoid applications of any voltage higher than maximum ratedvoltages to this high-impedance circuit.

Unused inputs must always be tied to an appropriate logic voltage level e.

Unused outputs must be left open. It uses this power toactivate two tone generators.

The two tone frequencies generated are switched by internal oscillator in jl2418 fastsequence and made audible across an output amplifier in the loudspeaker; both tone frequencies and theswitching frequency can be externally adjusted.

The device can drive either directly a piezo ceramic converter buzzer or small loudspeaker.

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In datahseet of usinga loud-speaker, a transformer is needed. An internal shunt voltage regulator provides DC voltage to the output stage, low frequency oscillator, andhigh frequency oscillator.


To protect the IC from telephone line transients, a zener Diode is included. Datasheet cisco series. MB Plus Electric Datasheet.

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