Synth DIY: Envelope Generators

An envelope’s basic purpose is to generate a changing control signal that ramps up and down between predetermined levels. Controls typically determine the rate of change of parts of the slope and/or the level a slope will reach. Some envelopes include controls for hold times for a certain stage of the envelope, or delay times before activation.

A more thorough explanation can be found in Sound On Sound’s Synth Secrets series, a very useful reference for many aspects of synth programming.

Various synthesizer envelope controls

Various synthesizer envelope controls

 

Even a cursory search shows there are so many envelope generator circuits to be found online that it might seem wasteful to present a few more. However, I wanted to collect a few of my own designs here to illustrate different kinds of envelope circuit, and to offer different ways of achieving them.

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Envelopes by type

AR (attack-release):

I will add more items to this list over time.

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2 responses to “Synth DIY: Envelope Generators”

  1. David Smith says :

    Since Curtis Electromusic has re-issued the CEM3340 for $15 each you could use that for your LFO or VCO DIY project

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