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