Components of the above is one component of ic which is applied as a reinforcement. Power amplifierused in an audio signal in order to become more powerful and can be heard via a tool that is the speaker. But in each set must have a voice amplifier, voltage, power quality is different.For the IC has the output power above 2 X 40 Watt with 8 Ohm output impedance. Supply voltage ranging from 18 Volt to 32 Volt. Part List Resistor R1_____1K R2_____1K R3_____22K R4_____22K R5_____1K2 R6_____100K R7_____560R R8_____1K R9_____1K R10____470R R11____4R7 R12____3K3 R13____3K3 R14____4R7 R15____470R R16____100R R17____100K R18____1K2 Capacitor C1_____470pF C2_____470pF C3_____4u7F C4_____4u7F C5_____82pF C6_____82pF C7_____47uF C8_____100uF C9_____10nF C10____39pF C11____100nF C12____47uF C13____47uF C14____100nF C15____39pF C16____10nF C17____100uF C18____47uF Intregated Circuit U1_____STK4773 , STK4793 , STK4803 , STK4813 , 4833 , 4843 , 4853 , 4863 , 4873 , 4893 , 4913. On every IC that I mentioned has a different power output.