High power amplifier circuit using LM3886
This LM3886 high power amplifier circuit electronic project is capable of delivering 68W of continuous average power into a 4 ohms load and 38W into 8 ohms with 0.1% THD+N from 20Hz–20kHz.
Main features of this LM3886 high power amplifier circuit electronic project 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 .
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 .