Abstract
This article describes the sound of the composition, function, and principle, which is mainly formed by the LM386 chip power amplifier circuit, LM324 quad op amp as the preamp and tone to enlarge constitute itself with supply voltage range, the static power consumption can be a single power use and low cost advantages. The LM386 ,a low output power, its maximum power reaches 5W or so, the static current, load capacity, dynamic current can drive large 4-16Ωspeaker, circuit simplicity, making convenient and reliable high-fidelity power amplifier, and an internal protection circuit. This design feature is the input audio signal amplifier, It is generally available for home audio systems,
stereo player and other electronic system, portable applicability.
Key words : LM386 OTL Output power
LM324 Magnification
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