Switching alarm sound generator(KD9561)

Published:2011/4/18 21:37:00 Author:Ecco | Keyword: Switching , alarm sound , generator | From:SeekIC

KD9561 is a CMOS four syllables music IC. With an oscilloscope observing the output waveform frequency square wave signal, the logic circuit can be considered as a digital signal. TWH8778 is the high power switching IC, it is suitable for processing digital signals, and it can be connected to CMOS IC directly as its high input impedance. The maximum output frequency of KD9561 is several thousand Hz, and TWH8778 can work up to 15 kHz. So there is not a matter of time digital signal processing when the former controlling the latter,and it should combine both and form a switching amplifying alarm sound generator. It can be used as police cars, ambulances, fire trucks and other alarm generator. Comparing with other linear audio amplifier, it has the advantages of simple structure, high efficiency, excellent cost. Although the sound quality is not perfect, its output power of amplifier could satisfy the requirements of general alarm sound, and the alarm generator does not need high-fidelity. The circuit is as shown in the chart.



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