Fixed Capacitors Advantages And Disadvantages

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Fixed capacitors are part of an electronic device or electrical appliance. It helps to maintain a constant charge and energy output. It is designed to obtain a fixed value of capacitance which cannot be changed. Fixed capacitors are mostly used in timing circuits of small appliances. They produce a more or less constant flow of energy to the device that enables uninterrupted use. It is also built with shut off capabilities to protect against situations such as power surges and overflow of energy. They are classified according to the type of material used as its dielectric. Examples of the materials are paper, oil, mica and electrolyte. Paper capacitors are made of flat thin strips of metal foil conductors that are separated by its dielectric material which is waxed paper. The range is from approximately 300 picofarads to about 4 microfarads. The working voltage is of a paper capacitor usually does not exceed 600 volts. Therefore, it used mainly for high voltage equipment. It is usually sealed with wax to prevent the harmful effects of moisture and to prevent corrosion and leakage. As it has a high leakage rate, it is unsuitable for AC coupling. The tolerance is also less than 20% which makes it unsuitable for precision timing circuits. There are two distinct types of mica capacitors, clamped mica capacitors and silvered mica capacitors. Clamped mica capacitors consisted of sheets of mica and copper foil clamped together while silvered mica capacitors replaced them and is

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