Isolate

Dual EQ filters

Back in the late 90s, I played a few gigs in Japan using a couple of SP-808s, Korg Er-1 and Pinky. Generally I’d just get something going and tweak the Isolators on the SP-808s, usual DJ type shenanigans.
Anyway, played a gig earlier this year, I only use a modular these days but wished I had an Isolator, so here are two.
They are simple EQ filters, all manually controlled.
The core circuit is based on a section of the PGM Isolator, don’t know where that came from, probably a 70s electronic hobby magazine.
The input stage boosts the signal by approx. 1.5x, feel free to adjust this (15k on the input op amp).
Feed them some drums and tweak.

https://www.nonlinearcircuits.com/modules/p/isolate