This is a very traditional configuration of an audio amplifier with 12 V power supply, providing a 1.5 W output under load of 8 ohms. The general purpose NPN and PNP transistors can be BC548 and BC558. The diodes can be 1N4148 and the adjustment of the resting current must be done in such a way as to measure -5.3 V at the collector of the input transistor. The trimpot can be 220-ohm which is the most common commercial value. The output transistors must be equipped with heat radiators.
