Digital Delay Pedal : 19 Steps (with Pictures) - Instructables
Echo Base digital delay - SabroTone
Index of /diy/Schematics/Delay Echo and Samplers
ElectroSmash - Time Manipulator: Arduino Delay/Echo/Reverb Guitar Pedal
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. :
ElectroSmash - Time Manipulator: Arduino Delay/Echo/Reverb Guitar Pedal