LM1558 circuits and projects

LM1558 - power supply related articles, circuits, reviews, this facilitates your site navigation. In every article you can find at the bottom, a special section with tags just like this - LM1558, and also different tags associated with the current article. Tags inter-links stories with the similar content, so if you click on the tag you will find only related content.
Wiki says: A tag is a non-hierarchical keyword or term assigned to a piece of information.