coil noise
coil whine

The amount of coil noise in a device will often seem to increase as the devices age.

Coil noise is, as its name suggests, caused by electromagnetic coils.

As previously mentioned, damping is a critical step towards reducing coil noise.

Low noise coils are specifically produced to avoid coil noise.

Coil noise can also occur in conjunction with the noise produced by magnetostriction.

Coil noise is also noticed most often when it is in the humanly audible frequency.

Coil noise is also affected by the irregularities of the magnetic material within the coil.

Motherboards can also produce coil noise.

Some steps to reducing coil noise include:

Fluorescent lamp ballasts are one example of devices that are designed to minimize coil noise.

Coil noise is a phenomenon in electronics which produces both undesirable audible sound and electronic noise.

Coil noise can be reduced by damping and can be minimized by design, but in some cases, unacceptable levels will remain.

Coil noise can be reduced in some instances by changing the shape of the coil to a figure eight rather than a traditional coil shape.

CRT monitors can produce coil noise, as can the external power supply for an LCD monitor or the voltage converter for the monitor's backlight.

Coil noise can happen, for example, when the coil is poorly secured to the circuit board, is poorly damped, or if the resonant frequency of the coil is close to the resonant frequency of the electric circuit.