Variable condensers
The variable condensers are those that, as its own name indicates it, they can change to will his capacity; that is to say, there are condensers provided with a such mechanism that, or they have an adaptable capacity between diverse values to be chosen, or have a variable capacity inside big limits. The first ones call trimmers and the second synchronization condensers, and they are much used in radioreceptores, TV, etc.
The mecanísmo devariación acts of some of the following forms:
a) Changing the surface of the armors.
b) Changing the separation between the armors.
c) Changing the dielectric.
The type condensers trimmer. The adjustment of these condensers is carried out only one times up to obtaining very precise values of capacity acting in his screw for adjustment of the rotor. If the value falters with the time for aging, the value of the capacity can readjust.
The variable synchronization condensers drive in the draft axis the badges of rotor that interfere between the badges of the stator increasing with it the surface of the conflicting badges and the capacity of the condenser.
Indication of the value of the condensers.
The values of the capacity of the condensers are printed on the same body of the component, especially in the electrolytic ones and in some cases of metallized polyester; but in the ceramic condensers it usually use a code of identification that continues a criterion very similar to the used one in the resistances. Nevertheless, nowadays there persist several systems or codes of different colors for the condensers, what makes difficult in certain way his identification.