DIY VCO Part 1: The analog oscillator core anyone can build

Build your own as a DIY eurorack kit: https://www.ericasynths.lv/shop/diy-kits-1/edu-diy-vco/ Support the channel... ... through Patreon: https://www.patreon.com/moritzklein ... by buying my DIY kits: https://www.ericasynths.lv/shop/diy-kits-1/ In this series, I'm taking a detailed look at how to build an analog VCO from scratch, using just a handful of cheap components. It's the basis for any synthesizer. To keep it as beginner-friendly as possible, I'm explaining what all the components do in detail. This first part deals with the oscillator core, op amp-buffers, AC coupling and voltage dividers. If you want to follow along, here's a bill of materials: 1x Breadboard 2x 9V battery plus clip OR 1x dual 9-15V power supply 1x 40106 IC 1x TL074 IC (you can also use a TL072, we won't be needing more than one op amp) 1x 1N4148 diode 1x 1 uF foil capacitor 1x 2.2 nF foil capacitor 4x 100k resistor 1x 3.5mm OR 6.35mm jack socket lots of jumper wires Chapters: 00:00 Intro & Sound Demo 01:18 Electricity & Oscillation Basics 12:13 Materials Overview & Build 16:20 Buffers & Negative Voltage 19:37 Offsets & AC Coupling 23:45 Voltage Dividers 26:39 Listening & Outro