→Schematics
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* Formant music synthesizer by [[C. Chapman]], Elektor, 1978, p. 64, using [[Operational amplifier|op-amps]] and common [[discrete]] components
* [http://yusynth.net/Modular/EN/ADSR/index.html yusynth ADSR] has a [[555]] core with a few op-amps.
* ''[https://drive.google.com/file/d/0Bx5_5krPS9HMcThRRHRObjRwMUk/ ADSR the Easy Way]'' by Thomas Henry, Polyphony, March/Apil 1982, pp. 22,23,30,3I.
'''CEM IC based'''
* Digisound 80 [http://www.digisound80.co.uk/digisound/modules/80-10/80-10.htm 80-10 Voltage Controlled Envelope Generator], uses [[CEM 3310]]. ''Electronic Music Circuits'' by [[Barry Klein]],1982, p. 62-3, includes [[Charles Blakey]]'s independent trigger input modification.
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