The is a cornerstone of hobbyist electronics literature, serving as a massive compendium for builders before the internet made schematics instantly accessible. The Legacy of the "1001" Series
He built it on a breadboard in twenty minutes. As soon as he connected the battery, a thin, mosquito-like whine filled the room. High, steady, annoying . He smirked, disconnected the battery, and the whine died. The is a cornerstone of hobbyist electronics literature,