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This is the 25W bridge audio amplifier built using single power IC TDA2005. Actually, the TDA2005 is a stereo power amplifier chip. It has two input channels and two output channel and delivers about 10W power output for each channel, since it connected in bridge mode then it will delivering up to 25W audio output. Take a note that the speaker terminals should not conected to the ground and mount the IC on the heatsink to prevent overheating.  25W Bridge Audio Amplifier with TDA2005 Circuit Diagram Parts List: R1 = 120K? R2,5,6 = 1K? R3,4 = 12? R7,8= 1? C1,5,7 = 220uF/25V C2,10,11 = 100nF C3,4 = 2.2uF/25V C6,8 = 100uF/25V C9 = 10uF/25V IC1 = LM2005M / TDA2005

This is the schematic diagram of 35W bridge power amplifier circuit, delivers 35W power output for 8? speaker. The circuit is similar to this 15W bridge amplifier. It use two pieces of amplifier IC TDA2030 (you may use LM1875 as subtitute/replacement).  Build a 35W Bridge Power Amplifier with TDA2030 Notes: Use 15V/3A power supply for maximum performance. Use heatsink to prevent overheating on the IC Parts List: R1,3,5,7,9 = 22K? R2,8 = 680? R4,6 = 1? C1 = 4.7uF/16V C2,7 = 22uF/16V C3,6 = 220nF C4,9 = 100nF C5,8 = 200uF/25V IC1-2 = TDA2030 / LM1875 Lsp = 8?/ 60W Loudspeaker

General Description: The CS44130 is a high-efficiency power stage for digital Class-D amplifiers designed to recieve PWM signals from a modulator such as the CS44800/600. The power stage outputs can be configured as four half-bridge channels, two half-bridge channels and one full-bridge channel, two full-bridge channels, or one parallel full-bridge channel. Features:  Configurable Outputs (10% THD+N) – 2 x 30 W into 8 Ω, Full-Bridge – 1 x 60 W into 4 Ω, Parallel Full-Bridge – 4 x 15 W into 4 Ω, Half-Bridge – 2 x 15 W into 4 Ω, Half-Bridge + 1 x 30 W  into 8 Ω, Full-Bridge  Space-Efficient, Thermally-Enhanced QFN  Package  PWM Popguard® Technology for Quiet Startup  > 100 dB Dynamic Range - System Level  < 0.12% THD+N @ 1 W - System Level  Built-In Protection with Error Reporting – Over-Current – Thermal Warning – Thermal Fault – Under-Voltage  Single (+10.8 V to +21 V) High Voltage Supply  High Efficiency (90%)  Low RDS(ON)  Low Quiescent Current  Lo...