ELECTRONIC_DOOR_BUZZER

Published:2009/7/8 22:52:00 Author:May | From:SeekIC

When S1 is depressed, an initial positive voltage is placed on C2 and the noninverting terminal of U1.The circuit oscillates at a low frequency. As C2 charges up through R3, a rapid increase in frequency of oscillation results, producing (at SPKR1) a rapidly rising pitched sound. This sound is easily recognized over ambient noise.



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