What is the difference between a metallized capacitor and a film-and-foil capacitor?
The difference is in the conductor layers. A metallized capacitor has a layer of aluminum conductor vapor deposited on a dielectric film. This metallization layer is very thin – on the order of Angstroms. Two layers of the metallized film are then wound together, so the cathode conductor is separated from the anode conductor by a layer of film on either side. The metallized capacitor has the advantages of size, simplicity, and price. Its disadvantages are a slight loss of transparency (due to the thinness of the conductor) and a slight intrinsic noise (due to inadequate internal damping). Metallized capacitors also tend to be strongly directional.
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