The Mad Blue Delay is an easy delay projects designed for all of the ones who are looking for a warmth analog-sounding delay.
Based on Mad professor’s famous Deep Blue Delay, this circuit has roots in one of the most famous delays in the DIY community, the Rebote by Tonepad as many of the others pt2399 based delays nowadays. For the development of this board, we took hours analyzing both schematics and experimenting with different values in order to create the perfect ultimate Blue Delay
This project is powered by a PT2399 digital delay chip through, but thanks to the analog signal path, it doesn’t have the sterile sound characteristics associated with modern digital delays but is instead much warmer and analog-voiced.
The direct signal path is short and made with analog amplifiers with no filtering. The echo signal has a tuned filtering to allow extreme settings without interference. There should be no distortion or tone coloration as long as the input level is in the range below the maximum allowed.
The delay is specially designed to work well with distorted tone, as this is the most critical application, where delays often fail.
Definitely the starting point for everyone who wants to jump into delays and modulation projects, and totally a must on your board!
For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum