YDS was established in Tainan, Taiwan, China in 1990 and Helmo Electronics in Xiamen, China in 1995. We are the leading manufacturer of power and magnetic components with ISO 9001/ISO 14001/IATF 16949 certification. Specializes in the manufacture of DC-DC, AC-DC power converters, RJ45 embedded transformers, 10/100/1G/2.5G/ 10G Base-T network filters, various transformers, inductors, LED drivers/lamps and mobile power supplies.