... EC42/ER42 high frequency transformer is: winding is convenient, the price is moderate,high reliability.Ⅳ. EC42/ER42 high frequency ... transformer useEC42/ER42 high frequency transformer used in the main transformer, LLC resonant inductor, DC - DC converter, switching power supply ... from RMB 7.5-15.The price is mainly depends on the complexity process of the product, customer demand for raw ...