Self-made analog delay pedal using BBD (BOSS DM-3 MOD)
How to Significantly Improve a Simple PT2399 Delay Circuit | Circuit Salad
PT2399 Digital Delay IC - DIY Audio Circuits
Amazon.com: DIY Delay Guitar Effect Pedal All Kits With1590B And 3PDT 9PIN Switch : Musical Instruments
Made a delay pedal using the ”PT2399” chip. The delay is pretty simple as of now, but I'm still working on it as well as maybe adding an atmega328(Arduino) to it. :
Pedal effect circuit design: getting started - EDN
Guitar FX Layouts: Crap-Fi Delay
Building a Tri-Effect Guitar Pedal - Circuit Cellar