Subscribe by email

LM3886 68W audio amplifier circuit

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 .

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 .

lm3886  pin configuration  lm3886-packageLM3886 68W power amplifier circuit diagram

Add new comment