This is the circuit diagram of a  powerful and high quality stereo amplifier  using IC TDA 1554. The circuit has only very few components. The circuit  works best with a 4 Ohm speaker. This is the figure of the circuit;

IC must be connected to a heat sink. A computer cabinet fan can also be used in addition(not necessary). Any way better the cooling better the performance. The circuit roughly draws 6A current at 12 V at full volume. So the power supply must be any thing more than 6A. Up to 18 V can be used ,which gives a bit more power boost. Commonly used is 12 V.
IC must be connected to a heat sink. A computer cabinet fan can also be used in addition(not necessary). Any way better the cooling better the performance. The circuit roughly draws 6A current at 12 V at full volume. So the power supply must be any thing more than 6A. Up to 18 V can be used ,which gives a bit more power boost. Commonly used is 12 V.
Parts List
R1              39K 1/4 Watt Resistor
C1,C2        10uf 25V Electrolytic Capacitor
C3              100uf 25V Electrolytic Capacitor
C4              47uf 25V Electrolytic Capacitor
C5              0.1uf 25V Ceramic Capacitor
C6              2200uf 25V Electrolytic Capacitor
U1             TDA1554 Two Channel Audio Amp Chip
MIS           Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input)
 
  
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