YDS was established in 1990 at Tainan, Taiwan and our factory Ho Mao electronics was established in 1995 at Xiamen, China. We are the leading manufacturer with ISO 9001 & ISO 14001 certified and specializes in various products such as DC/DC converter, AC/DC converter, RJ45 with magnetics, 10/100/1G/2.5G/10G Base-T Lan filter, Delay Lines, all kinds of Transformer, Inductor, LED Driver/Lighting products and Power bank.