This circuit was taken from Maxim documentation from the 1990s. It can be implemented on the basis of modern operational amplifiers. Power supply doesn't have to be symmetrical.
This is an old configuration that can be modified to operate with 5 V (use 1k on the base...
This power supply with several transistors can supply a current of several amps and a voltage of...
This amplifier with complementary output transistors delivers a 20 W load at 80 ohms. We find it...