Testing of components for fatigue under vibration conditions is important. The power converter includes a first resonant converter circuit and a second resonant converter circuit operatively coupled together. The user is thus able to navigate the network from the perspective of a search engine, viewing webpages, websites, and links in the same way a search engine would analyze them. A tube shaped element receives the row of seeds and spacers. A CTS signal is obtained by a sum signal of a photo-detector 6, and a push-pull signal is obtained by a difference signal \u2212 of a photo-detector 8. The method can include downloading a path and one or more images corresponding to positions along the path, wherein the downloaded images are actual images of an environment near the corresponding positions.