Available as an assembled Module and as a DIY project.
No info about availability.
Simplest continuous trigger
Perfect global command clocking or just to test a module...
Adjust the potentiometer for increase or decrease trigger speed
https://scontent.cdninstagram.com/hphotos-xaf1/t50.2886-16/11939731_1477133982611018_905861336_s.mp4