Bit of a classic guitar effect – the MXR Phase 90.

Electrosmash has an excellent reference that covers all things Phase 90, including the schematic  https://www.electrosmash.com/mxr-phase90.

JFETS can be pesky, so make sure you match them as best as possible and buy from reputable suppliers.

The script switch is strictly optional.   It’s one of those things that if you like a setting, you probably won’t ever change.  

MXR PHASE 90 – VERO LAYOUT