electro-music.com wiki | Schematics / Jurgen Haible Design Of M S10-MS 20 Type HADSR

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DIY | EG | ADSR | HADSR | MS10 | MS20 | Jürgen Haible | Synthi | Trapezoid

Jurgen Haible design of MS10/MS20 type HADSR as additional envelope generator for his Synthi Clone, from what he wrote on his page http://www.jhaible.de/tonline_stuff/hj_synclon.html :

The Trapezoid Generator contributes to the Synthi A's uniqueness, and I wouldn't replace it, but sometimes a "normal" envelope could be useful as well. I chose the Korg MS-10 / MS-20 style Hold-Attack-Decay-Sustain-Release circuit as an additional EG.

Component values are changed to match the +12V / -9V supply. The 1 MΩ potentiometers are a compromise. I've increased the integration capacitor to preserve the maximum time, but this also increases the minimum time.

This is surely not optimal, and I may change it some time. (several MOSFETs in parallel ?!)