Classification and Basic Characteristics of Capacitor Film Structures

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Capacitors have many different types depending on the dielectric used, such as electrolytic capacitors, paper capacitors, film capacitor, ceramic capacitors, mica capacitors, air capacitors, etc. However, the most commonly used in audio equipment are electrolytic capacitors and capacitor films. Electrolytic capacitors are mostly used in places where a large capacitance is required, such as filtering capacitors in the main power supply section, which not only filters but also stores energy. Capacitor film, on the other hand, are widely used in analog signal interconnection, bypassing (anti-interconnection) of power supply noise, and other places.

Classification of capacitor films

Capacitor films are capacitors with a construction that uses a metal foil as an electrode, which is overlapped with plastic films such as polyester, polypropylene, polystyrene, or polycarbonate and then wound into a cylindrical shape. Depending on the type of plastic film used, they are respectively called polyester capacitors (also known as Mylar capacitors), polypropylene capacitors (also known as PP capacitors), polystyrene capacitors (also known as PS capacitors), and polycarbonate capacitors.