The most remarkable feature of this
small stereo amplifier is the use of a
stepper motor bridge driver IC as a stereo
power output stage. The circuit diagram
shows a three-stage pulse-width modulation
(PWM) converter / amplifier for each
channel. The left (L) and light (R) audio
Input signals are first converted into triangular
waveforms by opamps IC1 and
IC2.which are wired as integrators, with
feedback from the power output stage via
resistors R7 and R11.
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