555_BEEP_TRANSFORMER

Published:2009/7/10 1:53:00 Author:May | From:SeekIC

The simple circuit transforms the steady beep of an audible-signal device, such as a Mallory sonalert, into a distinctive warble or chirp. The value of C2 determines just what tone color you'll get. With the 1-μF value shown, the circuit produces a warble similar to the ring tone of an inexpensive phone. A 10-μF value produces a chirp similar to a truck's back-up alarm. One elaboration of this circuit would be to use the second section of a 555 timer to drive a piezoelectric transducer instead of a sonalert; that modification would vary the tone's pitch, as well as the chirp rate.



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