[sdiy] Minisonic2 Envelope Shapers and Simulating a Moog

[Julian Bunn]

I'm having some trouble getting the Envelope Shapers to work properly in the
Minisonic2 I'm making. If interested, you can find the gory details in a new
section on my Minisonic2 web page:
http://pcbunn.cacr.caltech.edu/jjb/Synthesizers/Minisonic2/ (In fact I would
welcome suggestions on what may be wrong, if you are so inclined).

 

As a sanity check I downloaded a freeware Spice program and used it to
simulate the Envelope Shaper circuit, which of course behaved exactly as it
should do (sensible rise/decay times) and not as I was measuring with the
scope on my board. 

 

The next thing I'm going to simulate for fun is the VCF's ladder network.

 

It occurred to me that, given the circuit diagrams for e.g. a Moog, and a
lot of free time, one could enter everything into Spice and completely
simulate the behaviour of the instrument. With the results you could make a
faithful digital reproduction of the Moog. And you'd never need to touch a
soldering iron :-)

 

I'm wondering whether anyone has done this, for a Moog or any other type of
analogue synth.?

 

Julian

 

PS Perhaps simulating some of the obsolete semiconductors would be the
tricky part.

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