Here is a little audio transistor audio AMP amplifier agnate to what you ability acquisition in a baby transistor radio. The ascribe date is biased so that the accumulation voltage is disconnected appropriately beyond the two adulatory achievement transistors which are hardly biased in advice by the diodes amid the bases. A 3.3 ohm resistor is acclimated in alternation with the emitters of the achievement transistors to balance the bent accepted so it doesn't change abundant with temperature or with altered transistors and diodes. As the bent accepted increases, the voltage amid the emitter and abject decreases, appropriately abbreviation the conduction. Ascribe impedance is about 500 ohms and voltage accretion is about 5 with an 8 ohm apostle attached. The voltage beat on the apostle is about 2 volts after distorting and ability achievement is in the 50 milliwatt range. A college accumulation voltage and the accession of calefaction sinks to the achievement transistors would accommodate added power. Circuit draws about 30 milliamps from a 9 volt supply.