Audio amplifier circuit is a circuit that are combined with the Muscular Stimulator circuit for producing the relaxation sound, rain sound effect. It is an electronic circuit for amplification of signals within or somewhat beyond the audio frequency range (generally regarded as 20 to 20,000 Hz). Audio amplifiers may function as voltage amplifiers (sometimes called preamplifiers), power amplifiers, or both. The function of audio amplifier to amplify a weak signal to a level capable of driving a loudspeaker or other type of transducer such as headphones at the desired sound level. Power amplifiers may have power ratings ranging from less than 1 W to several hundreds of watts.
Audio amplifier circuit use TDA2822 as the audio amplifier IC. TDA2822 is a dual low voltage power amplifier that are designed for portable cassette players and radios. It has several features such as wide operating supply voltage – Vcc = 1.8V to 12V, low crossover distortion, low quiescent circuit current and bridge/stereo configuration.
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