
We posted 25 sounds this past month. I sort of went a little crazy with mixes, producing three of them.
First is the compiled mix, which focuses on (what I felt were) the best sounds of the month:
Electric hum, mains hum, or power line hum is an audible oscillation at the frequency of the mains alternating current, which is usually 50 or 60 hertz depending on the local electric utility configuration.... Assuming a tempered scale with A=440Hz, a 60Hz tone is almost exactly halfway between A# and B two octaves below Middle C....So perhaps I'm hearing a 60 hertz tone in the electric hum of these motors.
[I]n 1980, Michael Caffrey patented what would later become the Yomega Brain, a yo-yo with a centrifugal clutch transaxle. Designed with a free-spinning ball bearing linkage, "The Brain" could spin much longer than previous fixed-axle designs. In addition, the axle was "clutched" with spring-loaded weights which would pull away from the axle at higher speeds and grab again at lower speeds. The result is an automatic return of the yo-yo when speed drops below a given threshold.The noise is very cool, and if there's a note it's close to a B2: