Topic

mains hum

2 videos. Ranked by independent recommendations, not by views.

1. 

   1 The hidden background noise that can catch criminals

   Tom Scott 4 people · 5 months · since Dec 2021

   Tom Scott's explainer on how small drifts in grid frequency leave a hum in recordings that can date footage, shared as a fascinating aside.

2. 

   2 60 Hz Hum

   deseehc 4 people · 4 months · since Nov 2013

   A sound clip of mains frequency transformer hum, linked so people can compare a buzzing device or power supply against a known reference.