A widely-used push-pull configuration of an AB class amplifier is shown ... Q1 and Q2 represent shortcuts for the output transistors because usually these output devices are Darlington or ...

Class AB amplifiers have been the workhorses of the audio world, thanks to their simplicity, and their ability to deliver high power levels with low distortion. But there are also a number of gremlins ...

The base forms the input and its bias circuit is identical ... You will often find it used as a buffer stage for this reason, and a handy example can be found on the output of an early op-amp ...