Description:  All parts and components of this product are original products, unpretentious and pure in quality; using high-quality original parts not only guarantees safety and quality, but also has a long service life, and more importantly, it is a strong guarantee that the actual performance can reach the design goals.     Features:  1. Use the disassembled machine 2SA1494/2SC3858(random).  2. The electrolytic capacitor adopts imported electrolysis to ensure strong and continuous power support.  3. High-precision resistors are used for the resistance, and the main circuit uses high-precision resistors with a precision of ??1%, which ensures a good signal-to-noise ratio of the whole machine.  4. The PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tinning process to ensure good passing performance of large and small currents. First-class PCB quality, first-class production technology.  5. This board can be debugged as Class A, B or Class A.  6. The sound quality is soft, beautiful and powerful, comparable to LM3886.     Specification:  Product name: power amplifier board.  Main voltage: 30V to 80V.  Speaker protector voltage: AC12-18V.  Power: 300W+300W.  Material: PCB+metal.  Size: 170x100mm.     Package included:  1 x Amplifier Board.     Note:  Adjust the current clockwise to increase, and counterclockwise to decrease the current. Adjust according to the size of the radiator