This pedal is one of my favorites. The original design allowed for a too-tight of a fit in a 1590A. This layout has tightened up the board and fixed some of the issues. It fits more easily in a 1590A.
However, if you want to put it in a 1590B or bigger, you can do that, too!
Circuit designed by Rick Holt (a.k.a. frequencycentral)
delyk layout based on Rick Holt’s Birthday Edition layout
Permission to sell PCBs granted by Mr. Holt