There are two types of aluminum electrolyte capacitors, the plain foil type, and the etched foil type. The thickness and aluminum oxide film and high breakdown voltage give these capacitors very high capatainence values for their area. The foil or metal plates of the capacitor are anodized with a DC.
There are also many types of capacitors that can be used. Ceramic capacitor: the ceramic capacitor is a type of capacitor that is used in many applications from audio to RF. Most common: Electrolytic Capacitor is the type of capacitor that is affordable.
Tantalum capacitors offer a very high capacitance level for their volume. Silver mica capacitor, polystyrene film capacitor, and glass capacitors are very expensive. Supercap capacitors have substantial values of capacitance. These capacitors include some of the other main capacitor types used for more specialized applications.
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