Gyrator Circuits in Guitar Pedals (Bad Monkey, DOD Grunge, Boss Metal Zone & Heavy Metal)

If math is not your jam, skip to 9:46 when the equations start to go straight to the the schematics.

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0:00 -- Introduction
0:48 -- Op amp gyrator
2:46 -- Circuit analysis
8:18 -- BJT gyrator 
9:47 -- Metal Zone
10:20 -- Heavy Metal
10:38 -- DOD Grunge
11:14 -- Bad Monkey