XH-A201 6J1 HiFi Class A Tube Preamplifier Board with Acrylic Case for Audiophile Amplifier Projects-OKN514-16
600W High Power DC to DC Boost Converter 12 to 60V to 12 to 80V Constant Current LED Driver-OKYN02293
High Efficiency DC DC Buck Converter 8 to 55V to 3.3V 5V 12V Adjustable Step Down Power Supply Module Voltage Regulator-OKYN401-39