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Polystyrene Film Capacitors
In these devices, polystyrene film capacitors is used as the dielectric. This type of capacitor is not for use in high frequency circuits, because they are constructed like a coil inside. They are used well in filter circuits or timing circuits which run at several hundred KHz or less, Above about the Polystyrene Film Capacitors information content.
The component shown on the left has a red color due to the copper leaf used for the electrode. The silver color is due to the use of aluminum foil as the electrode, Above about the Polystyrene Film Capacitors information content.
The device on the left has a height of 10 mm, is 5 mm thick, and is rated 100pF.
The device in the middle has a height of 10 mm, 5.7 mm thickness, and is rated 1000pF.
The device on the right has a height of 24 mm, is 10 mm thick, and is rated 10000pF.
These devices have no polarity.