Designing a simple audio compressor from scratch

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Simulation in CircuitJS: https://tinyurl.com/2qj8o66t
Subtractor op amp explanation:    • Designing a classic transistor-VCA fr...  

In this episode, we'll DIY our way towards a simple audio compressor circuit, based on my diode VCA. If you want to build along, here's the bill of materials:

1x TL074 quad op amp
1x TL072 dual op amp
11x 1N4148 small signal diode
1x 10 uF capacitor
1x 100k log potentiometer
2x 100k lin potentiometer
1x 20k lin potentiometer
10x 100k resistor
2x 20k resistor
2x 14k resistor
1x 4k7 resistor
1x 1k resistor

Chapters
00:00 Intro & what is compression?
04:21 Rough circuit structure
06:12 Diode VCA
09:48 Peak detector
14:19 Voltage subtractor
16:24 The gap & how to get rid of it
21:34 The ratio control
23:32 Attack & release
27:45 Sidechaining & outro