Welcome to our shop! Description: High quality filter power supply. The four pins of the rectifier are connected in parallel with decoupling capacitors, effectively eliminating high frequency interference from the AC power grid. Two 2200UF25V electrolytic capacitors filter the negative power supply, and the voltage is stabilized using the 7815 and 7915 double DC power supply. The clutter interference from the power grid is minimal and the voltage is stable, resulting in better performance. The chip has a high conversion rate and strong drive ability, with a wide frequency band and very low noise. Features: 1. Power supply circuit adopts full bridge rectifier. 2. Effectively eliminate high frequency interference from the AC power grid. 3. Chip has a high conversion rate and strong drive ability. 4. Better performance, very small noise. 5. Cannot use 12V battery or DC directly as power supply. Specifications: Working Voltage: AC double 15V (10W) Audio Input: RCA sockets Audio Output: 3P terminal Input Voltage: 3P terminal Size: 110mm x 54mm x 22mm Package includes: 1 x Pre-amplifier Board DIY Set 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.