You can observe a Class D audio amplifier's output if you introduce the filter circuit in Figure 1 . Based on Maxim's MAX-9727 quad-audio-line driver, IC 1 , the circuit combines separate single-ended ...

Before we connect the power supply, extract IC2 and IC3 from its base and adjust the potentiometers to middle position. On one of IC2 or IC3 entries connect a frequency-meter and/or oscilloscope. On ...