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18 Watt Audio Amplifier circuit diagram

Amplifier parts:
P1____22K Log. Potentiometer (Dual-gang for stereo)
R1___1K 1/4W Resistor
R2___4K7 1/4W Resistor
R3___100R 1/4W Resistor
R4___4K7 1/4W Resistor
R5___82K 1/4W Resistor
R6___10R 1/2W Resistor
R7___R22 4W Resistor (wirewound)
R8___1K 1/2W Trimmer Cermet (optional)
C1___470nF 63V Polyester Capacitor
C2,C5___100µF 3V Tantalum bead Capacitors
C3,C4___470µF 25V Electrolytic Capacitors
C6___100nF 63V Polyester Capacitor
D1___1N4148 75V 150mA Diode
IC1___TLE2141C Low noise, high voltage, high slew-rate Op-amp
Q1___BC182 50V 100mA NPN Transistor
Q2___BC212 50V 100mA PNP Transistor
Q3___TIP42A 60V 6A PNP Transistor
Q4___TIP41A 60V 6A NPN Transistor
J1___RCA audio input socket

18 W BTL Audio Power Amplifier HA13118

The HA13118 is power IC designed for component car stereo amplifiers. At 13.2 V to 4 Ω load, this power IC provides an output power of 18W with 10% distortion. It is easy to design as this IC employs internal each protection circuit and the new small package. 
Circuit Diagram:
Datasheet for HA13118:Download

18W mono class-D Amplifier

Features: 18W OUTPUT POWER:RL = 8Ω/4Ω; THD = 10%HIGH EFFICIENCYWIDE SUPPLY VOLTAGE RANGE (UP TO±25V)SPLIT SUPPLYOVERVOLTAGE PROTECTIONST-BY AND MUTE FEATURESSHORT CIRCUIT PROTECTIONTHERMAL OVERLOAD PROTECTIONCircuit Diagram: Datasheet for TDA7481:Download

18W Audio Power Amplifier Circuit

General Description: The AN7170 is an integrated circuit manufactured by high voltage process designed for power amplifier of bus, track amplifier. Wide operating supply voltage range with output of 18W at 26.4V. It can be widely used for bus, truck amp., car stereo, home entertainment stereo set and TV sound multiplex output.
Circuit Diagram:

18W MONO CLASS-D AMPLIFIER

Features:

18W OUTPUT POWER:RL = 8Ω/4Ω; THD = 10%HIGH EFFICIENCYWIDE SUPPLY VOLTAGE RANGE (UP TO ±25V)SPLIT SUPPLYOVERVOLTAGE PROTECTIONST-BY AND MUTE FEATURESSHORT CIRCUIT PROTECTIONTHERMAL OVERLOAD PROTECTIONCircuit Diagram: