Metalized Plastic Film Capacitors Vs Ceramic

In plastic film capacitors aluminum sheets acts as electrodes and plastic sheets acts as dielectric.

Metalized plastic film capacitors vs ceramic.

Some ceramic capacitors change their value when the voltage changes which causes low frequency distortion in audio circuits. Film capacitors can be broadly categorised into plastic film capacitors metallized plastic film capacitors and composite film capacitors. The different types of metallized plastic film capacitor provide different properties each suited to slightly different applications. Film capacitors are capacitors which use a thin plastic film as the dielectric.

They are generally less expensive than other capacitors and carry lower capacitances couple of µf max which makes them used often during low capacitance requirements in noise harmonics filtering and suppression applications. Some ceramic capacitors are microphonic and produce noises in high gain audio circuits. When sufficient voltage is applied a point defect short circuit between the metallized electrodes vaporizes due to high arc temperature since both the dielectric plastic material at the breakdown point and the metallized electrodes around the breakdown point are very thin about. The rated ac load for an ac capacitor is the maximum sinusoidal effective ac current rms which may be applied continuously to a capacitor within the specified temperature range.

The same dielectric materials are used in the construction of these different types of film capacitors. Use metalized plastic film capacitors for coupling and filtering audio. Ceramic disc capacitors have a low loss factor a reasonable level of stability and work well with high frequencies. Capacitors for ac applications are primarily film capacitors metallized paper capacitors ceramic capacitors and bipolar electrolytic capacitors.

Made of ceramic material as the dielectric and metal as the electrodes ceramic capacitors come in a variety of shapes and sizes. This type of capacitor is very inexpensive to build and most look very much like figure 1. Essentially they use a metallized plastic film to enable the electrodes to the created and spaced apart from one another. Once the film is manufactured it may be metallized or left untreated depending on the needed properties of the capacitor.

This film is made extremely thin using a sophisticated film drawing process. There are a few types of plastic film capacitors including mylar polycarbonate polyester and.