Metallized polyester film capacitors are very commonly used in transformer less power supply design. Film capacitors, Metallized polyester film capacitors, film dielectric capacitors, or polymer film capacitors, generically called film caps as well as power film capacitors, are electrical capacitors with an insulating plastic film as the dielectric, sometimes combined with paper as carrier of the electrodes. The electrodes of film capacitors may be metallized aluminum or zinc applied directly to the surface of the plastic film.
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