The Electrolytic capacitor

The electrolytic capacitor consists among other things of an oxide coating as dielectric. With this condenser aluminum foil is provided with an oxide coating, which represents the dielectric. This aluminum foil serves as condenser lining, wärend the other component from electrolyte i.e. from an electrically leading liquid exists.

The condenser is characterised by a high tension strain and the oxide coating is very thin. For this reason one knows on small area high-capacitive electrolytic capacitors manufactures which is afterwards polarized. The condensers may be used only with DC voltage. The aluminum foil represents thereby the positive part and to electrolyte the negative pole.

By a wrong polarity of the condenser the oxide coating diminishes itself. During this procedure warmth develops and it develops gases as a cause for an explosion of the electrolytic capacitor to see is. A wrong polarity is however innocuous up to a tension of approx. 2 V nearly always. Thus then also alternating voltage enterprise with the condenser is possible, if one does not exceed the permissible Amlituden.

Tantalum electrolytic capacitors are to be regarded as special form. The dielectric Tantalpentoxid contained there is equipped with a still higher dielectric constant, whereby the Kapazitätswerte per unit volume are clearly larger in the Gegesatz to aluminum Elko. The anode of the condenser bestht from tantalum in foil, wire or sinter form. Tantalum electrolytic capacitors are almost independent with their capacity of the ambient temperature and of the operating voltage.

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