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add some glue (e.g. a layer of glue is often added on the top of television coils ; over the years, this glue degrades and the sound level increases) change the shape of the coil (e.g. change coil shape to a figure eight rather than a traditional coil shape) isolate the coil from the rest of the device to minimize structure-borne noise
Early devices were based on an electromechanical system identical to an electric bell without the metal gong. Similarly, a relay may be connected to interrupt its own actuating current, causing the contacts to buzz (the contacts buzz at line frequency if powered by alternating current) Often these units were anchored to a wall or ceiling to use it as a sounding board.
Light buzzing can happen with plug-in and hardwired fixtures, so your lamp or chandelier could be the culprit. Luckily, that low-pitched sound wedging right between your ears is often the result ...
A 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10 ...
Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.
Why is my computer running slow? Several factors may cause a computer to run slow. Consider the age of your computer; older computers may struggle to run newer, resource-intensive software.
Site for old PC without sound cards. Programming the PC Speaker, by Mark Feldman for PC-GPE. Programming the PC Speaker, by Phil Inch: part 1, part 2 (includes a very detailed explanation of how to play back PCM audio on the PC speaker, and why it works) Bleeper Music Maker A freeware to use the PC speaker to make music (superseded by BaWaMI ...
Electromagnetic interference divides into several categories according to the source and signal characteristics. The origin of interference, often called "noise" in this context, can be human-made (artificial) or natural.