Building Blocks

Here’s a list of open-source building blocks for Synth DIY projects. These are tried and tested circuits, so hopefully they will prevent you from having to re-invent the wheel when it comes to commonly used elements.

Digital Input to Microcontroller

Most microcontrollers run on either 3.3V or 5V logic, whereas Eurorack gates and triggers are usually between 5-8V....

CV Input to Microcontroller

Many digital modules will need at least one CV input, however you have likely noticed that while Eurorack can have ±12V travelling through its patch cables, most microcontrollers will be very unhappy to receive anything outside of the range 0-3....

Bake your own vactrols !

An optocoupler allows signal transmition between two isolated circuits with two parts: an LED that emits infrared light and a photosensitive device (LDR) which detects light from the LED....