The four-output power supply circuit consisting of 5V/3A, 3.3V/4A, 12V/0.3A and 5V/0.025A consisting of LM2641 is shown in the figure. The LM2641 is a dual adjustable buck switching power supply controller with an input voltage range of 5.5 to 30V, 2.2 to 8V dual output adjustable, operating frequency of 300kHz, and load regulation error of 0.5%. It can be soft-started with undervoltage and overvoltage protection.
The Bluetooth wireless speaker is the terminal of the entire audio system, to convert the audio energy into corresponding sound energy and radiate it into the space. Bluetooth speakers usually consist of speaker, crossover, cabinet, sound absorbing materials and so on. Bluetooth speaker is a device that converts audio signal into sound. In general, it means that the main body of the speaker or the subwoofer box has its own power amplifier. After the audio signal is amplified, the sound is played back by the speaker itself, making the sound louder.
Advantages:
1: Perfect support for the tablet and mobile phone. The transmission is stable. the distance is generally 10 meters.
2: Miniaturization, fashion, and versatility.
3: The sound quality is delicate and soft. The appearance is more delicate and beautiful.
The sound pressure level of the sound is not too high, and the power received is relatively small.
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