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(Note that the LDRs don't react to light here – you can only change their resistances via the sliders.)
My phone decided to unlearn proper white balancing at some point during filming. Sorry. Time to get a camera I guess.
In this series, I'm taking a detailed look at how to build an analog VCF from scratch. Things get spicy this episode, as we begin to tackle the trickiest part of synthesizer circuit design: voltage control.
If you want to follow along – which I strongly recommend –, here's a bill of materials:
1x TL074 quad op amp
3x 5mm red LED
2x Light dependent resistor
1x 100k linear potentiometer
2x 100k resistor
3x 600 ohm resistor
2x 33 nF foil capacitor
1x Pack of FIMO
Chapters:
0:00 Resonant High Pass
6:00 Voltage Control - Difficulties
9:04 Vactrol Basics
13:10 DIY Vactrols
16:03 Basic LED Driving
19:30 Offset Voltages & Voltage Mixing
22:38 Fixing the frequency range
26:50 Sound Demo & Outro
