Feature:1. Filter Board: Using 7812/7912, 7815/7915, 7805/7905, 7809/7909 for voltage stabilization, the highest input voltage is negative and positive 35V.2. Reliable Work: Has 4 main filter electrolytic capacitors, divided into two levels of filtering, single capacity 470uF, total capacity 2300uF.3. Practical Use: Can be used as front end power supply for NE5532, OP275, AD826, etc., or various AD circuits that require positive and negative power supplies.4. Broad Utility: Can also work as power supply for sensor, instruments, providing power with low internal resistance, low noise, and low ripple.5. Easy to Install: Compact in size and light in weight, the installation is very convenient to finish.Specification:Item Type: Filter BoardVoltage Regulator: Negative and positive 12V. Board Size: Length: Approx. 71mm / 2.8inWidth: Approx. 30mm / 1.18inHeight: Approx. 25mm / 0.98inMaximum Input Voltage: Dual AC voltage is 22V, the maximum. .Package List:1 x Filter BoardNote:Before using the board, please confirm the output voltage of the power transformer used, and the range of power fluctuations, and reserve a certain voltage margin.