LOU_COST_CHIME_CIRCUIT

Published:2009/7/2 4:11:00 Author:May | From:SeekIC

Resistor R1, capacitor C1, and two inverters form a square wave generator, which produces the basic tone. The generator is followed by an inverter that acts as both a buffer and a driver for the speaker. Resistor R2, which has a minimum value of 100 ohms, limits the current and controls the volume. Diode D1, ca-pacitor C2, resistors R3 and R4, and two inverters create the pulse generator that determines the turn-on and decay times of the chime. The decay circuit-formed by D2, C3, R5, and Q-reduces the amplitude of the chime tone exponentially as a function of time.



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