DIY 9V Modular System


Eurorack is everywhere, there's a billion tutorials and resources for it. There's a million tutorials on 9V stuff but no youtube series like this, so I figured I'd make one.
Personally I just like to work with single supply power - I don't use eurorack or anything like it. It's also pretty easy to run this stuff off a 9v battery or even 6v from some AAs if you feel like having it run slower and lower.



The latest and greatest... Slim Series (NEW)


Module 1: Dual CD40106 VCO

This is a VCO utilizing the CD40106 hex inverter chip, it is a design that is very popular among synth DIYers and has been adapted in numerous ways. Here's what I believe is the source of this design.

Paper Circuit


Module 2: Vactrol VCA

This is even simpler and more iconic than the VCO. Primordial module, any number you like.


Module 3: Hard-Sync Squelcher

Now we're getting more creative. This module consists of a VCF, square wave oscillator slaved to the input, mixer knob, and 2 LFOs.

Paper Circuit


"Module" 3.5: Touch Keyboard

This is inspired by the ciat-lonbarde tetrazzi. It's a bare-naked relaxation oscillator with a piezo preamp, and a vactrol to attenuate the oscillator.

Paper Circuit