Audio Amplifier With RC BandPass Circuit

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Audio Amplifier with RC bandpass curcuit
A Very Low Noise Single Stage Audio Amplifier that incorporates a simple RC Bandpass filter on its output. When fed into a 10 K Load, its output is shown in the yellow block with an RMS output of 1.03 mV.

The filter is designed around the voice standard of 300 to 3000 Hz. Its 3DB cutoff point on the low end is around 320 Hz and the 3DB down cutoff at the high end is around 2.56 DB as shown in the Bode Plot above. In between the two, basically flat.