This very simple amplifier was found in the Philips Databook of 1990. The circuit is suitable for headphones and other battery powered applications.
Obtained in an Electronic Design from 1968, this circuit has the voltages determined by the zener...
In the figure we have an amplifier step configuration with a transistor suggested by a 1985...
The circuit in the figure below is suggested by Sanyo and provides 10 W power at 4 ohms and 6.8 W...