Se indican en la fig. 1 y están constituidos por dos arrollamientos con menos espiras que los transformadores de otros tipos que vimos en lo aticulo ART082S .

 

Figura 1 – Transformadores de FI
Figura 1 – Transformadores de FI

 

Su uso se encuentra principalmente en aparatos de radio y TV, trabajando con señales de frecuencia elevada.

Su núcleo consiste en un trozo de ferrita que se puede desplazar entre las bobinas para poder ajustar su funcionamiento.

 

TRANSFORMADORES DE RF O RADIOFRECUENCIA

Estos pueden tener o no núcleo de ferrita. Cuando tienen núcleo, se representan mediante líneas punteadas en el diagrama o esquema, y cuando no existen diremos que el núcleo es el propio aire. Fig. 2.

 

Figura 2 – Transformadores de RF
Figura 2 – Transformadores de RF

 

Son utilizados en circuito de radio, tanto en transmisión como en recepción de señales, viniendo determinado el número de espiras que lo forman por la frecuencia de la señal que debe de recibir o producir.

 

BOBINAS

Las bobinas tienen el aspecto y símbolos que se indican en la fig. 3.

 

Figura 3 - Bobinas
Figura 3 - Bobinas

 

Como se puede ver, la diferencia respecto al transformador estriba en que las bobinas están formadas por apenas un arrollamiento, que puede tener una o varias tomas.

Estas tomas se realizan enrollando cierto número de espiras y haciendo una conexión en el punto deseado, continuando arrollando después para otra toma o para el final.

Los núcleos de las bobinas se representan de la misma forma que en los transformadores, teniendo diversas aplicaciones.

Podemos decir que una bobina en baja frecuencia, normalmente, se usa para no dejar pasar frecuencias con ciertas características, dejando pasar otras de características diferentes.

En los circuitos de alta frecuencia se usan, normalmente, en sintonía, es decir, en la separación de una frecuencia determinada de las demás.

 

 

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