Uploaded March 2021 | Updated September 2026, 2 weeks ago
This is a how-to video that shows how to hack an Ali Express karaoke delay PCB to become a Eurorack delay module (aka the 卡拉OK! Karaoke Delay). I go through the entire process (hence the 25 min length) -- the last 7 minutes are a demo to show it working (and to show how fun this thing is with just a sine wave and a bit of CV). Jump there first, if you like.
My starting point is the information at addictivenoise.com. I made some tweaks to Jan's info on that website, including a couple shortcuts and using one of the unused opamps to drive the LED used in the DIY vactrol.
The PCB can be purchased from Ali Express here: bit.ly/3cnvag2 . The panel can be ordered OSHpark here: oshpark.com/shared_projects/v1CKNV5j (you'll get 3 for that price) or from Pusherman: pushermanproductions.com/product/karaoke-reverb-panel
Some other references:
waveformmagazine.com/waveform-delay-waveform-diy-project-1-1
todbot.com/blog/2020/10/02/eurorack-diversion-pt2399-karaoke-delay-module-hack
addictivenoise.com/projects
synthanatomy.com/2018/04/diy-makes-possible-eurorack-delay-fx-module-less-15.html
PS - if you want an image showing a labeled view of the 2 traces that I cut in the video, here it is: dropbox.com/s/gi8d83enuwekh5j/tracestocut_shared.png?dl=0
This is a how-to video that shows how to hack an Ali Express karaoke delay PCB to become a Eurorack delay module (aka the 卡拉OK! Karaoke Delay). I go through the entire process (hence the 25 min length) -- the last 7 minutes are a demo to show it working (and to show how fun this thing is with just a sine wave and a bit of CV). Jump there first, if you like.
My starting point is the information at addictivenoise.com. I made some tweaks to Jan's info on that website, including a couple shortcuts and using one of the unused opamps to drive the LED used in the DIY vactrol.
The PCB can be purchased from Ali Express here: bit.ly/3cnvag2 . The panel can be ordered OSHpark here: oshpark.com/shared_projects/v1CKNV5j (you'll get 3 for that price) or from Pusherman: pushermanproductions.com/product/karaoke-reverb-panel
Some other references:
waveformmagazine.com/waveform-delay-waveform-diy-project-1-1
todbot.com/blog/2020/10/02/eurorack-diversion-pt2399-karaoke-delay-module-hack
addictivenoise.com/projects
synthanatomy.com/2018/04/diy-makes-possible-eurorack-delay-fx-module-less-15.html
PS - if you want an image showing a labeled view of the 2 traces that I cut in the video, here it is: dropbox.com/s/gi8d83enuwekh5j/tracestocut_shared.png?dl=0
