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Founded in 1969, Cosel Co., Ltd. is a professional manufacturer dedicated to producing AC-DC switching power supplies, DC-DC converters, and modules. Cosel offers a range of electronic components, including semiconductors, which are used in electronic products such as industrial and consumer equipment. Semiconductor devices like ICs, FETs, transistors, diodes, etc., rely on stable DC power supplies for operation. In particular, Cosel's "switching power supply," which utilizes the high-speed switching effect of semiconductors, is one of our flagship products. Switching power supplies are known for being compact, lightweight, and highly efficient, making them integral components in almost all electronic devices, including information and communication devices, medical equipment, and factory automation devices. Furthermore, since 2005, Cosel has expanded its product line to include filters designed to protect electronic equipment from various forms of noise interference. With a history spanning over 50 years, Cosel holds the top position in Japan's standard switching power supply market share. Headquartered in Osaka, Japan, Cosel Co., Ltd. has sales subsidiaries in the U.S., Europe, and Asia, with our production subsidiary located in Jiangsu Province, China.