Envelope Generator III

Version 0.1.1 from March 2021

Envelope Generator that I built for my modular synth drum machine project.

Features

• ✅ Attack and release
• ✅ 2 outputs (for e.g. VCO pitch and VCA)
• ✅ Visual indication a.k.a. LED

Details

It’s based on “The Fastest Envelope in the West” by René Schmitz. I removed the Decay and Sustain from the original design. Both were not crucial to my drum machine project.

The potis I use here are from Piher (PC-16 series) and the jack sockets are from Cliff (FCR1281).

Resources

• Video Demo
• Schematic (PDF)
• Breadboard Prototype (PDF)
• PCB Bottom Layer (PDF)
• Front Panel (PDF)

Improvement Potential

At the beginning there is a small unwanted voltage spike. You can hear it in the video. In my case no problem, because I use the release only in my drum machine project.

Also see the comments on Instagram and Reddit.