00538pamaa2200157 4500 0000017122 20060602090000.0 0750698217 621.381044 LEN TK7868.P6 LEN 1995 LENK Simplified design of switching power supplies John D. Lenk. Boston: Butterworth-Heinemann, 1995. xv, 224p.: 24cm. Electronic apparatus and appliances -- Power supply -- Design and construction Switching power supplied -- Design and construction