Here, the Arduino is configured to generate a sine wave signal using “Fast PWM.” The sketch prepared will produce complimentary PWM on D3 and D11 of the microcontroller ... as indicated in the wiring ...

Figure 2 A microcontroller and some passive filters produce a sine wave, a ramp, and a dc signal. CCR1 and output TB1 produce the sine wave. CCR2 and TB2 generate ... use at least a 16× oversampling ...