Stereo Headphone Amplifier with LM386


Posted on Aug 28, 2012

Audio-taper pot, R1, adjusts input level into two LM386 amplifier chips. The LM386 is a low-voltage audio power amplifier, designed to operate on 4V to 12V. It has an internal 15K feedback resistor between pins 1 and 5 which would set the gain at 20 (26dB).



At this gain, the output noise is slightly audible, so R2/R4 is added, effectively in parallel, to reduce the gain to 11 (21dB). Since the extra feedback is taken after the output coupling cap, C3/C7, it also flattens the low end response. Distortion is r




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