This is a 18W audio amplifier circuit based on power IC HA13118. The supply voltage required for this circuit is 8 – 18V DC, at least 1 to 2 Amps. Maximum output power will only be obtained with a power supply of 18V at greater than 2 A, using a 4 ohm speaker. The power supply should be well filtered to reduce mains hum, a regulated supply will reduce noise even further. Extra filtering is unnecessary if operating from a battery supply.

Components

Resistors :
R1, R2___________________ 2R2 ohm

Capacitors :
C1, C2, C4, C5, C6_______ 100uF/16V electrolytic capacitor
C3_______________________ 10uF/16V electrolytic capacitor
C7, C8, C12______________ 100nF
C9_______________________ 2,200uF/25V electrolytic capacitor
C10______________________ 1uF/50V electrolytic capacitor
C11______________________ 100pF

Misc.
I.C._____________________ HA13118
Heatsink