Switch type KD9561 alarm sound generator introduction

KD9561 is a CMOS four-tone music IC. Observing the output waveform of the KD9561 as a variable frequency square wave signal can be regarded as a digital signal in the logic circuit. TWH8778 is a high-power switch IC, which is very suitable for processing digital signals. Because of its high input impedance, it can be directly connected to CMOS IC. The maximum frequency of KD9561 output is only a few kilohertz, and TWH8778 can work up to 15 kHz, so the former control The latter does not have the processing time problem of the digital signal, so the combination of the two can constitute a switch-amplified alarm generator. Such as alarm generators for police cars, ambulances, fire trucks, etc. Compared with other linear audio power amplifiers, it has the outstanding advantages of simple structure, high efficiency and excellent cost performance. Although the sound quality is not perfect, it is used for the alarm generator without high fidelity. The output power of this amplifier is used for The general alarm sound can meet the requirements. The circuit principle is shown in the figure.

Switch type KD9561 alarm sound generator introduction

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The 8-inch tablet will have a big impact on the 7-inch and 10-inch tablet market. Because the portability of an 8-inch tablet is stronger than that of a 10-inch tablet, and the usable area is larger than that of a 7-inch tablet. The most important thing is that the price is more moderate, which is much cheaper than a 10-inch tablet. It can be said that the 8-inch tablet computer has a good balance between portability and screen display area, and is more likely to be favored by the majority of users.


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