Possible New Project--EMS VCS3 Trapezoid EG Clone

[camelneck]

Yves,
I'm currently in the process of building your EMS VCS3 VCF clone. I've always loved the sound of this filter especially for sound effects and I'm sure this module will bring me a step closer to producing some of those classic VCS3 sounds. However, since I only have conventional ADSR and AR EG's which cannot be looped, I will be limited as to which of the classic VCS3 sounds I can produce. (The EMS VCS3 had a special trapezoid EG with controls for attack time, on time, decay time, and off time, and it could be made to loop or recycle if so desired.)

Have you ever thought about designing a clone of this EG? It would make the ultimate companion for the VCS3 VCF as I mentioned earlier. I'm sure that a number of other people would also be interested in purchasing PCB's for this module if you were to design it.

I do remember seeing a schematic of the original EMS VCS3 EG somewhere on line not long ago and I'm 99% sure that all of the parts that were used by EMS for this EG are still readily available. (I think EMS began using BC-type transistors in the late 1970's to replace the original transistors, which are obsolete, and these replacement transistors are still readily available from what I remember.) I also think Juergen Haible built a pseudo clone of this module once upon a time.

David

[yusynth]

No it is not in my plan to design a module based on the EMS trapezoid.
For looping modulation I use mostly LFOs and sometimes LFOs retriggering EGs.

[v-un-v]

An EMS traperzoid generator clone? YES PLEASE!!!