DIY SYNTH VCF Part 2: Active Filters & Resonance

Support the channel: In this series, I’m taking a detailed look at how to build an analog VCF from scratch. We’re picking up the pace somewhat in this episode, since the topic is quite complex. If you need refreshers on certain concepts, here’s a list of links: Negative voltages, diodes & power supply: Voltage dividers: AC coupling: If you want to follow along – which I strongly recommend –, here’s a bill of materials: 1x TL074 quad op amp 1x 100k linear stereo potentiometer (if you can find one, use a 500k - gives you much more range) 1x 100k linear mono potentiometer 2x 200k resistor 1x 100k resistor 1x 33k resistor 1x 10k resistor 1x 6k8 resistor 2x 1uF foil/ceramic capacitor 2x 10nF foil/ceramic capacitor 6x 14148 diode Chapters: 00:00 Intro 02:28 Amplification & op amps 08:19 What is resonance? 11:25 Resonant filter analysis & build 15:43 Feedback control 20:37 Volume balance & distortion 24:05 Clipped feedback 25:55 Sound demo & outro