Without 1541IC without 7220ICWithout 1541IC without 7220ICThe latest version is blue PCBn Using disassembled original TDA1541+SAA7220+CS8412+NE5534n The main circuit of the electrolytic capacitor signal adopts Taiwan, and the main filter capacitor adopts the special electrolytic capacitor capacity of 2×4700UF from Sanwa, South Korea, and a full-wave bridge rectifier circuit to ensure strong and continuous power support.n The resistance adopts five-ring metal resistance, and the main loop adopts five-ring metal film resistance with an accuracy of ±1%, which ensures a good signal-to-noise ratio of the whole machine.n PCB adopts 1.6mm thick double-sided board, 2.0 ounce copper thickness, and full tin-spraying process to ensure good passing performance of large and small currents. PCB quality.nUSB module needs to be purchased independently Basic parameters:Voltage: dual AC15-0-15V 10W (or dual 12V-0-12V) single 9V 10WBoard size: 115*165mmSpot is blue PCB