21. TiVo's remote will let you control the volume and power for a TV or audio amplifier . 22. Power MOSFETs with lateral structure are mainly used in high-end audio amplifiers and high-power PA systems. 23. The practical amplifier circuit to the right could be the basis for a moderate-power audio amplifier . 24. Practically all commercial audio amplifiers are voltage amplifiers. 25. Transistor audio amplifiers work the same way, except they use a variable input as the tracking source. 26. :: : I left only the power supply and the audio amplifier with volume and tone controls. 27. I work with audio amplifiers reasonably often. 28. Class?Audio is a leading manufacturer of high-end audio amplifiers and other related A / V components. 29. You can certainly find balanced audio amplifiers that are 3 terminal but ground isn't a signal terminal. 30. Thus the output of an inexpensive car audio amplifier is limited by the voltage of the alternator. 