Step-up & Step-down & AC to DC 등의 다양한 회로도
http://electronic-circuits.blogfa.com/page/dc-to-dc-converter.aspx
IC : NE555 / LT1074 / HV4205E / MC34161 / LT-1073-5 / LM2576
http://electronic-circuits.blogfa.com/page/dc-to-dc-converter.aspx