Designing a diode ladder filter from scratch
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Complete project on falstad: https://tinyurl.com/y7eftwyz
In this video, I'll walk you through the process of designing a diode ladder VCF from scratch. Since the topic is rather advanced, I don’t go into great detail about most basic components & what they do. If you are just starting out, I recommend you first watch the rest of my series on filter design. You can find previous episodes here:
Analog Filtering Basics: • DIY SYNTH VCF Part 1: Analog Filterin...
Active Filters & Resonance: • DIY SYNTH VCF Part 2: Active Filters ...
Vactrol-Based Voltage Control: • DIY SYNTH VCF Part 3: Resonant High-P...
Also, if you need a refresher on how the inverting op amp-configuration works, I recommend watching my video on a sawtooth-to-triangle converter, which you can find here: • DIY SYNTH Quick Tip: Sawtooth-to-Tria...
If you want to follow along – which I strongly recommend –, here's a bill of materials:
Semiconductors
11x 1N4148 diode
Capacitors
2x 1uF foil capacitor
5x 1nF foil capacitor
ICs
2x TL074
Resistors
2x 200k resistor
2x 100k resistor
1x 47k resistor
8x 33k resistor
2x 10k resistor
1x 2k7 resistor
2x 2k resistor
1x 1k resistor
1x 330 resistor
Potentiometers
2x 100k linear mono potentiometer
Misc
3x audio jack socket
Chapters
00:00 Intro
01:39 Sound Demo
03:49 Diodes as Resistors?
10:31 Bias Current & Trickery
14:02 Multi-Pole Diode Ladder
17:23 Driving the Ladder
25:22 Output Stage
27:42 CV Processing
30:53 Resonance
34:45 Final Demo & Outro
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