This schematic use the IC AN7120 for main system power amplifier with support some other components. In this circuit have a good sound quality. Because output noise is very very minimal , not even be heard in the distance of 5 Cm from the sound. Description from this circuit , voltage minimum required 6 volt and maximum voltage 20 volt , you can choose voltage between it. Maximum output Power 15 Watt with impedance 4 Ohm.
See Schematic Power Amplifier below :
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