Features: The front input capacitor and the inter-stage coupling capacitor use Siemens top-level capacitor 2.2UF. The electrolytic capacitor signal main circuit adopts a famous Taiwanese brand. The main filter capacitor adopts a capacity of 4×4700UF. It uses a rectifier flat bridge of 10A and above to ensure strong continuous power support.  The resistance uses five-ring metal resistors, and the main circuit uses a five-ring metal film resistor with an accuracy of ±1%, which ensures a good signal-to-noise ratio of the whole machine.  PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tin spraying process to ensure good passing performance of large and small currents. First-class PCB quality.  This machine adopts an all-aluminum chassis, and the surface of the chassis is treated with wire drawing oxidation coloring process.  The wiring layout of the whole circuit board is quite rigorous and reasonable, and the whole PCB wiring adopts a point grounding method.  The power amplifier board is stable and reliable, with large output power; beautiful and round sound, and open sound field. It has strong three-dimensional effect, stable and powerful low frequency, excellent signal-to-noise ratio, wide dynamic range; clear details, excellent transient response, and can play all kinds of music freely. It has a very good performance in the home sound environment.  The wiring of this board is very simple, and it can be assembled into a beautiful sound stereo HIFI combined power amplifier with few parts, which is very suitable for audio enthusiasts. You can also replace with more suitable and better parts according to your own understanding of the circuit, and enjoy the fun of the DIY process.  Power:40W+40W;  Working Voltage:AC220V;  Outer Packing Size:length 260*width 115*height 50 MM;     Package Included: 1 x Power Amplifier