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LM3886 68W audio amplifier circuit

2014-11-02 10:39  
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This 68W audio amplifier circuit is based on LM3886 integrated audio amplifier which is capable of delivering 68W of continuous average power to a 4ohms load and 38W into 8ohms with 0.1% THD+N from 20Hz–20kHz.
Main features of LM3886 68W audio amplifier circuit are: 68W output power into 4Ω at VCC = ±28V, 38W output power into 8Ω at VCC = ±28V , 50W output power into 8Ω at VCC = ±35V , Signal-to-Noise Ratio ≥ 92dB , input mute function , Output protection from a short to ground or to the supplies via internal current limiting circuitry , Output over-voltage protection against transients from inductive loads , Wide supply range 20V - 94V .

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The LM3886 maintains a good S/N (signal-to-noise) Ratio of above 92 dB .
This audio amplifier can be used in applications like : Self-powered speakers , Surround-sound amplifiers , High-end stereo TVs and others audio applications .

22uF capacitor provides the gain curve start from about 7 Hz so it filters unwanted low frequencies .
If we use a toroidal transformer we need an center trapped 2x18 volts for 4 ohms load impedance or 2x24 volts for 8 ohms load .

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