This is 4/6 stage OTA based phase shifter by Rick Holt of Frequency Central fame. Here is a link to epic thread about this and a 4 stage design over at DIYStompboxes.com. Here’s my build, which is working but has a couple issues that need to be worked out before it’s ready for prime time.…
Just tested this one again. My mistake the shape pot is working. It seems to me that the Width pot seems to square off the LFO wave form as it is turned up. With Width all the way up the LFO seems to produce more of a square wave.
This will be the fourth time I try to build one of these. I made a PCB for the original using the layout from GGG. I never finished this. Then I built and finished a second using the layout from UStomp.com. I couldn’t get this to work. I forget what the problems were, it was…