The VCADSR 7B is a fully voltage-controlled ADSR envelope generator chip. In addition to 0-5V CV control of Attack, Decay, Sustain, and Release, it also includes CV control of output level and includes an overall Time CV for modulation of the envelope time.Download Electric Druid VCADSR 7B Datasheet
The datasheet includes example circuit diagrams, example waveforms, and the chip pinout diagram.
There are further details on the VCADSR 7B project page.
Obsolete! This chip has been superseded by the EnvGen8
The new chip combines the features of the old LoopEnv chip, has improved resolution, and also no longer requires a crystal. It’s an improvement in pretty much every way! Head over and check out the data sheet.