Here the 50W AF power amplifier circuit powered with single IC STK4036II. Use heatsink to prevent overheating on the IC.
STK4036II features:
• Compact package for thin-type audio sets
• Member of pin-compatible series with outputs of 20 to 200W
• Easy heatsink design to disperse heat generated in thintype stereo sets
• Constant-current circuit to reduce supply switch-on and switch-off shock noise
• External supply switch-on and switch-off shock noise muting, load short-circuit protection, thermal shutdown and other circuits can be tailor-designed.
Download STK4036II datasheet HERE
