Designing a production-ready audio compressor

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https://www.ericasynths.lv/shop/diy-k...

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Simulation in CircuitJS: https://tinyurl.com/2nr4f72k

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In this episode, we'll DIY our way towards a production-ready audio compressor circuit, based on the simple compressor I developed in my previous video. If you want to build along, here's the bill of materials:

Resistors
470k x2
330k x1
220k x1
120k x1
100k x11
47k x1
33k x4
20k x1
10k x4
3k3 x4
2k x1
470Ω x 1
200Ω x 1

Capacitors
1.5µF (film/foil) x3
680pF (681) x1

Diodes
1N4148 (signal) x13

Transistors
2N3904 (NPN) x5

Potentiometers
1M x1
500k x1
100k x2
20k x1
10k x1

ICs
TL074 (quad op amp) x1
TL072 (dual op amp) x2

LEDs
3mm (red) x5

Chapters:
00:00 Intro & Gain Reduction Indicator
05:17 Full Wave Rectifier
08:36 Attack Mode Switch
11:16 Variable Input Gain
14:00 Variable Make-Up Gain
15:51 LED-based VU meter
18:53 Assembly & demo