LM3886+NE5532 Subwoofer Amplifier

LM3886 is a high-power mono audio power amplifier integrated circuit, 11-pin single in-line package, with a complete protection circuit inside. At 70V power supply, it can output 50W continuous average power on 8Ω load, which is very suitable for making bass amplifiers. This circuit is a subwoofer power amplifier made by LM3886 with NE5532 pre-stage, which can achieve better listening effect when matched with subwoofer speakers. The circuit diagram is as follows:

LM3886 Performance:

　・VCC=±28V OUTPUT=68W/4Ω、38W/8Ω
　・VCC=±35V OUTPUT=50W/8Ω
　・Peak power: 135W
　・Signal-to-noise ratio ≥92db
　・Slew rate: 19V/us
　・Intermodulation distortion: 0.04%
　・11-pin TO-220 package
　・Mute function
　・SPiKeTM protection functionLM3886
has two models: LM3886TF and LM3886T. The former has insulated heat sink and the latter has not.

NE5532 is a high-performance dual op amp, which is often used as a preamplifier in audio circuits, as is the case in this circuit.