EEVblog #626 – Ceramic Capacitor Voltage Dependency

Dave explains, shows, and measures a potentially big trap with using high value ceramic capacitors.

If your 10uF capacitor really 10uF in your circuit?

Those humble X7R caps you think are a “stable” dielectric? think again…

Class II and above ceramic capacitors can vary their capacitance drastically with DC bias voltage level and also the applied AC voltage.

Links:

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Capacitor Tutorial – Ceramics & Impedance

The piezoelectric effect demonstrated

Forum HERE

from EEVblog - The Electronics Engineering Video Blog http://ift.tt/1kMpa0k

via Yuichun