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 ...

The voltage drop across the 555’s output transistors increases rapidly if the output current is much above 100mA. Also see : Active-filter circuit and oscilloscope inspect a Class D amplifier’s output ...

The Class D amplifier, which is having a massive, albeit largely unacknowledged effect on consumer audio devices, is responsible.

May 21, 2011 [Ben Laskowski’s] been working on a Class-D audio amplifier for several months. What you see above is the most recent version of the amp.