DIY SYNTH VCF Part 2: Active Filters & Resonance
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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: • DIY SYNTH PSU: How to design a simple...
Voltage dividers: • DIY VCO Part 1: The analog oscillator...
AC coupling: • DIY VCO Part 1: The analog oscillator...
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
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