We really like the idea of an
old-school analog synth, so we didn't
want to use a MIDI to CV converter. We looked at a bunch of CV
keyboards from PAIA, MFOS, and an interesting one from the old ETI
magazine. I even have a set of schematics for the Oberheim Two-Voice,
which I always wanted to try to build. And when researching, I ran into
RichardC64s site, which just happens to have a modern update of the
Oberheim 2-voice. I purchased a raw keyboard years ago that already has
the scanning matrix diodes, so now we just need to build the rest of
the circuit. We're going to go with the DAC0800 for the D/A, since it
seems easier than matching resistors.
This isn't really a SDIY, since
I was given this filter by the good
people at EML when I worked there while in college. But we are going to
incorporate this into our modular synth.
The ADSR we chose was the dual
ADSR from Bareille. It has really
cool lights for each step.
We want a VCA not just for the
audio, but also for control voltages
(i.e. run an LFO through a VCA to get a variable effect). The MFOS has
been getting a lot of good reviews as well as the Thomas Henry from the
21 Century book.
Years ago I had a Korg MS-10 synth. I really liked the LFO on the
because it had a wave shape control for the triangle, so you could do
up, ramp down, or a triangle. It also had a square wave that you could
change the pulse width on. It turns out that Oakley Sound makes a MOTM
version of this very LFO, only they put two in one module. This is the
will use on our project.