Subwoofer amplifier schematic diagram

Amplifier circuit is very suitable for use in subwoofer speaker, because its strong. This circuit using ic, ic based on STK. to use it can be used on cars that use speakers or a subwoofer system in his car. 30 V supply voltage that has been rectified. Power output 20W mono.
subwoofer schematic

Part List :
R1 = 100K
R2 = 47R
R3 = 100R
R4 = 1R
C1 = 220uF
C2 = 100uF
C3 = 100uF
C5 = 10uF
C6 = 1uF
C7 = 1uF
C8 = 1000uF
C9 = 0.1uF
IC = STK011 , STK015 , STK016

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