Starting a little CMOS synth build

[Sonosus]

@AriaSalvatrice

I wanted to make it fancier with amplification, and had such a fancier circuit working on a breadboard, but understanding op amp negative feedback still makes my head spin, so I’ll put one in a future module once I take the time to experiment with them more, and read more about the theory.

I didn’t include much theory here but I made this cheatsheet with a bunch of the most common op amp configurations for building and reading schematics:

Op-amp cheatsheet

I made this purely for my own use; it’s by no means complete, but I thought that folks here might benefit. [SCAN0074] I use it to help figure out other people’s designs.

Theory wise, there are a lot of maths heavy, written-by-and-for-engineers op amp ‘tutorials’ online - they’re amazing if you already know most of the concepts but have a lot of extra fluff - IMO they’re not that great for beginners just wanting the basics to hack together a synth

I would highly recommend @moritzklein 's YouTube
channel where he designs (more traditional synth) modules from scratch and explains each component and concept along the way. Even if your noisebox isn’t built quite like a Eurorack system the VCO series is a great primer to analogue electronics.

Moritz Klein

His documentation for the Erica Synths modules are edited versions of the video scripts if you’re not as partial to videos: Erica Synths - mki x es.EDU .