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These amplifiers using IC KA2202 and KA2207, which has a power output of 2.3 Watt berimpedansi 4 ohms. Minimum supply voltage and maximum 5Volt 20Volt. See schematics and component list below.
Part List
R1 = 100K
R2 = 56R
R3 = 56R
R4 = 1R
Use 1/4 Watt resistor
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C1 = 100uF
C2 = 100uFC4 = 100uF
C5 = 470uFC6 = 100nF
C7 = 470pFC8 = 2,2nF
C9 = 100uF
U1 = KA2202 , KA2207