ElectroSmash - Time Manipulator: Arduino Delay/Echo/Reverb Guitar Pedal
DIY Reverb Pedal Circuit: Spring-Hall Reverb with PT2399 IC – Deeptronic
Using the Hot Springs Reverb - PAiA - DIY Music & Sound Electronics Kits - Synthesizer, Theremin, Studio | Electronic kits, Free energy, Guitar effects
How to build your own spring reverb unit | Guitar.com | All Things Guitar
spring reverb analogue predelay "design" | GroupDIY Audio Forum
Stage Center Reverb Guitar Effect - Circuit Scheme
Build Your Own Spring Reverb | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.