This one is Ray Wilson’s DIY synthesizer website.
I first saw him on youtube, screwing around with an echo rockit noise box. I was hypnotized.
I found his site and was hooked. I spent the next couple years making synthesizer modules at a manic pace.
The magical thing about Ray’s site is is his teaching style. He gives the circuit schematics, but also explanations of how/why they work in language that is pretty easy to understand. He really approaches electronics from a practical standpoint rather than what you’d get in an intro class somewhere. This website was my introduction to electronics, and it can get you far when it comes to understanding analog design and signal processing.
You can really get a feel for Ray’s personality from his writing on the site. He died in 2016, and I weirdly get a little choked up when I look at that echo rockit page. His website was a right-time-right-place thing for me, and it helped change the trajectory of my life in a very real way.
Anyways. Check out Music From Outer Space, and like Ray would say, Good learning…
They run on 1V per octave control voltage. Lots of keyboards can output that natively, the arturia keystep is what I have because it has some sequencing capabilities as well.
There are tons of circuits out there for midi to CV conversion. Arduino is harder than you’d expect because it can’t output straight analog so you need to interface with a DAC or filter of some kind. Temperature compensation is also pretty important. Obviously not insurmountable problems, so there are lots of DIY designs of varying quality. Here’s the second one I found on a search: https://github.com/elkayem/midi2cv
You can have a really good time with the sound lab mini synth 2 and a sequencer or keyboard. It has 2 voices so you can animate a drone and sequence/play over the top. Or use it to drive spectrally rich audio into a bigger system for processing with mutable modules or whatever. Sky’s the limit :)
If you want a relatively straightforward, but still really cool project, the echo rockit is where it’s at. Makes a great effect and is still a fun stand alone noisebox.