A power supply circuit comprises: a first voltage booster circuit that receives a first clock signal having a fixed frequency, and supplies a voltage to a prescribed circuit; and a second voltage booster circuit that receives a second clock signal having a frequency corresponding to an operating frequency of the prescribed circuit, and supplies a voltage to the prescribed circuit. The jaw member includes a cam slot that is a space formed by opposed cam walls located in the jaw arm. Extraction may include analysis of the content sources to determine wordphrase frequency, topic, andor other parameters. The upper of both shoes are preferably substantially similar in shape and size, such that the second shoe fits snugly within the shoe cavity of the first shoe. A reference module is suitable for detecting a variation of the output voltage. Below the pockets, the shower curtain is formed of an air permeable material such as nylon mesh.