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6 5W audio power amplifier

This amplifier circuit based on the ic, and the use here is that where ic STK4017 IC has output power of 6.5 watts with the impedance 8Ohm. Minimum required supply voltage and maximum 20Volt 35 Volt DC.

Component
R1 = 100K
R2 = 2K7
R3 = 27R
C1 = 22uF
C2 = 100uF
C3 = 100uF
C4 = 100uF
C5 = 100uF
C6 = 47uF
C7 = 330uF
C8 = 100uF
U1 = STK4017
Besides using STK4017 ic, ic and can use that I mentioned the following:
STK4019
STK4021
STK4023
STK4025