Inverters Module

A utility module for my DIY Modular synthesiser, providing 4 analogue inverters and 2 logic inverters.

There isn’t much to this module, but it’s handy to have around. The 4 analog inverters allow flipping the phase of the input signal, which can be useful when you need the opposite shape of a modulation control voltage. It is made out of a very common “inverting opamp” circuit. The logic inverters are simpler still, built around a single NPN transistor each.

This module got from “I think that would be useful” to completed module in my rack within a single day, which was pretty satisfying.

Work Involved

Schematic capture (KiCad)
PCB design (KiCad)
Panel design (Inkscape)
Laser cutting at local makerspace
PCB etching, drilling, cutting
PCB assembly
Panel assembly

Here’s a view of the side:

Side view of inverters module, showing the home-etched PCB and wiring A single chip is socketed in the centre.

Design files are available on GitHub: Inverters module