This circuit is not safe. It worked in my environment, but in the worst case it would destroy your module.
Optical Hi-hat Controller for Roland module and YAMAHA PCY-135
I tested with Roland TD-10(TDW-1).
Movie : https://www.youtube.com/watch?v=P2LfMGCmFY8
Blog : https://open-e-drums.tumblr.com/post/186932283524/optical-hi-hat-controller-for-roland
I am a designer, maker, engineer in Kyoto, Japan.
From June 2016, I began making electronic drums as a hobby.
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