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TDA2003 is a cheap amplifier that is designed to run on single rail power supplies (unipolar). It provides a high output current capability (up to 3.5A), very low harmonic and cross-over distortion.  18W TDA2003 bridge Circuit Diagram TDA2003 bridge 18W amplifier TDA2003 can be used as an BCL (bridge amplifier) and car deliver up to 18W.

18W Amplifier Schematic Circuit Part List 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 Power supply parts: R9______________2K2 1/4W Resistor C7,C8________4700µF 25V Electrolyti...