This power amplifier circuit is most popular power amplifier using IC STK0105, powerfull power amplifier have output power about 100W at 8 Ohm Load with voltage supply about 50VDC. If you want to build or knowing inside IC STK0105 im publish the IC STK0105 Schematic Diagram that the circuit drawn by Bassblaster505 you can see more at EasyEDA see the link below :
Schematic Diagram of IC STK0105
Part List STK0105 Intregated Circuit
D1, D2 = 1N4001
R3 R1, R2, R3, R4, R5, R7, R9, R6, R8, R10 = 1k
TR1, TR2, TR3, TR5, TR7 = 2DC2412R
TR4, TR6, TR8 = BC807_16
If you finished making your own IC STK0105 , you must to assembling the ic with following circuit for working power amplifier using IC STK0105.