This power amplifier circuit specially designed for car audio systems. This LA4741 160W BTL power amplifier IC gives four audio outputs with 40W of output power through 4Ω speaker. For best result, circuit must be building on PCB. It requires only a minimum of external components. The IC comes with built-in protection circuitry of over-voltage, thermal & short circuit protection. You can operate this circuit by 12 volts 15 ampere source. But, its supply voltage range between 9V to 18V. The IC extremely heat up in operational state, use high quality heat-sink as heat dissipation equipment.
IC1 : LA4741
R1 : 10KΩ/ 0.25W
C1 : 47μf/ 25V Electrolytic
C2, C3, C4, C5 : 0.22μf/ 16V Electrolytic
C6 : 33μf/ 25V Electrolytic
C7 : 0.1μf (104) Ceramic
C8 : 3300μf/ 25V Electrolytic
SP1 – SP4 : 4Ω 50W or 60W Speaker
Power Source : 12V/ 15A DC
Use proper heat-sink to LA4741 IC. Apply heat-sink compound (Thermal paste) between IC & heat-sink.