Ceramic Capacity Noise

In some cases the piezoelectric effect may result in the appearance of electrical noise while in other cases.

Ceramic capacity noise.

There is almost no noise generated by the capacitor itself. However when a capacitor is mounted on a board the vibration increases and when the cycle of the amplitude reaches the audible frequency range 20hz 20khz of humans it can be heard as a noise. Johnson nyquist noise thermal noise johnson noise or nyquist noise is the electronic noise generated by the thermal agitation of the charge carriers usually the electrons inside an electrical conductor at equilibrium which happens regardless of any applied voltage thermal noise is present in all electrical circuits and in sensitive electronic equipment such as radio receivers can. For example the noise sounds like a hum hiss or a high pitched tone.

An acoustic sound may be heard emanating from the capacitor itself. Capable of replacing 2 or more conventional devices the x2y ceramic capacitors are ideal for high frequency filtering or noise suppression of supply voltages in digital circuits and can prove invaluable in meeting stringent emc demands in dc motors in automotive audio sensor and other applications. Most dielectrics of ceramic capacitors exhibit a characteristic identified as piezoelectric effects than can cause unexpected signals in certain circuits.