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synth-modules/EG_555
cinnaboot 619fcc3490
EG_555: update front panel slot dimensions 		4 weeks ago
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EG_555_front_panel EG_555: update front panel slot dimensions 4 weeks ago
EG_555_mainboard EG_555: update PCB mask layer 1 month ago
README EG_555: fix V- connection for TL072 2 months ago

README 

envelope generator based on "The Fastest Envelope in the West"
by René Schmitz, https://www.schmitzbits.de/adsr.html

the modifications to the original circuit are: feed 5v into the control pin to clamp the output to 0-5V, use 100k/1k in/out impedances, add a front panel led that matches the gate input, and add a manual trigger switch to the front panel.