Schematic of a 2.1 channel amplifier based on the TDA2030A, from Technical Mriganka, in a 416 KB PDF. The TDA2030A is a well-known monolithic power amplifier IC, often used in small stereo and subwoofer builds. The drawing helps with assembly and fault finding: supply pins, feedback networks and the bass filter stage. Check heatsinking and the supply voltage range against the TDA2030A datasheet, and confirm you have a genuine part.
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