“This is small power (Less than 10Watt) transistor amplifier using LM386 and TIP41/42.
Although output power is not much impressive, still it can well serve as an amplifier for PC speaker and MP3 player.
When living in a packed apartment together, a half output power from this amplifier easily produce complains by my family.
Anyway, it can drive 8ohm and 4ohm speaker with maximum 12V power supply.
I got the original schematics from the website (http://www.bristolwatch.com/radio/lm386_power_amp.htm, Lm386 Audio Amplifier Adding Push-Pull Output Stage).
As the circuit not using dual polarity (+/-) power supply, overall circuit complexity is not much high and compact size (15cm(W) x 10cm(D) x 5cm(H)) of chassis can be used as shown in the picture above.
I had made several amplifiers with original schematics and the one of them shown in the picture above is the final version which applied slight modifications from the original.”