常用运放IC LM386 低压音频小功率放大器.pdf LM386 Low Voltage Audio Power Amplifier September 1997 LM386 Low Voltage Audio Power Amplifier General Description Features The LM386 is a power amplifier designed for use in low volt- n Battery operation age consumer applications. The gain is internally set to 20 to n Minimum external parts keep external part count low, but the addition of an external n Wide supply voltage range: 4V……