[sdiy] Haible HADSR kerfuffle

ulfur hansson ulfurh at gmail.com
Wed Feb 27 05:55:02 CET 2019

hello list!

i recently built Jurgen Haible’s voltage controlled HADSR, and looking at the schematics it looks like U6A is incorrectly drawn: 


the op amp is there for hysteresis, right? 

in that case i would think one shouldn’t connect the negative input to positive...?

i haven’t found anyone documenting a build of this design, so if you have ever attempted this i’d love to hear about your experience!

as always, many thanks for your thoughts and comments :)

all the best,

Sent from outer space
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