IC BA514 it's the main of this circuit. This is actually low power output with minimum power output 2 W but maximum output 10W . Minimum voltage require 9 Volt and maximum voltage 14 Volt . Impedance output 4 Ohm.Power Amplifier Schematic below :
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All capacitor with uF and minimum voltage capacitor is 16 V. resistor with 1/4 Watt.