Figure 2: Capless Class AB headphone amplifier circuit with mid rail bias amplifier and output signal illustration. This design has the advantage of removing the large and sometimes unreliable ...

Transistors often find use as three-pin amplifier devices, in which the input and the output share one pin. Thus, the input and the output must have the same voltage at this pin. On the other hand, a ...

Bias circuits for class AB buffers (Fig. 1a) can take several forms. One alternative (not necessarily the best) is usually called the “old VBE doubler” (Fig. 1b).

It’s a simple yet elegant circuit with fewer parts than an equivalent class AB amplifier, and there was a time back in the day when it was all the rage.

The Class D amplifier offers an answer to this challenge by achieving much higher efficiency than Class AB amplifiers. Operating on switching principles, rather than exploiting the linear portion of ...