Learn how to build an analog voltage-controlled oscillator (VCO) from scratch in this comprehensive tutorial video. Explore the fundamentals of electricity and oscillation, and gain hands-on experience assembling the oscillator core using affordable components. Discover the roles of op amp-buffers, AC coupling, and voltage dividers in synthesizer design. Follow along with a detailed materials list and step-by-step instructions, making this an ideal starting point for beginners interested in DIY synthesizer construction. Delve into topics such as negative voltage generation, offset adjustment, and proper signal routing to create a functional VCO core.