Some recordings taken with pickup coils of electromagnetic fields from various devices. Due to the nature of these recordings, they are mono, and somewhat noisy. As an example, here’s a demo of the recording taken from an optical mouse:
The pack can be downloaded from the Samples page.
I have also added an expanded version to the FSA Patreon page, which includes longer versions of several sounds, plus an extra “bonus” sound. Supporters at any level will be able to download this and other exclusive content.