KD9561 is a CMOS four-tone music IC. The waveform at the output end is observed as an inverter square wave signal with an oscilloscope. It can be considered as a digital signal in a logic circuit. TWH8778 is a high-power switching IC, which is very suitable for processing digital signals, and can be directly connected to CMOS IC due to its high input impedance. The highest frequency of KD9561 output is only a few kilohertz, TWH8778 can work up to 15 kilohertz, so the former controls The latter does not have the problem of processing time of digital signals, so combining the two can form a switch-amplified alarm sound generator. Such as alarm generators for police cars, ambulances, firetrucks, etc. Compared with other linear audio power amplifiers, it has several outstanding advantages of simple structure, high efficiency, and excellent cost performance. Although the sound quality is not perfect, but it is not required for high fidelity for the alarm generator, the output power of this amplifier is used The general alarm sound can meet the requirements. The circuit principle is shown in the figure.
Din Rail Connectors,Din Terminal Block,Din Rail Mount Terminal Block,Rail Terminal Block
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