“¿Puedo cambiar un potenciómetro por un LDR en un circuito para hacer el control por la luz? ¿Qué tipo de LDR debo utilizar?”

En principio, en cualquier circuito podemos sustituir el control manual hecho por un potenciómetro, por el control por luz hecho por un LDR. Debemos sólo atentar para algunos detalles. El primero es necesario verificar si en el rango de control que deseamos, el LDR presenta la misma resistencia que el potenciómetro. Por ejemplo, en un control de luz, debe variar de la misma manera que el potenciómetro utilizado en el rango de luz que deseamos el control. El segundo detalle está en la potencia disipada. Los LDR no son dispositivos de disipación elevada. Así, un LDR común sólo reemplazará un potenciómetro en una aplicación de baja corriente. Para una aplicación de alta corriente en la que debe sustituir un potenciómetro de hilo, se debe utilizar un LDR grande (2,5 cm, por ejemplo). Se tiene en cuenta que el LDR sólo sustituye a los potenciómetros en las aplicaciones en las que los potenciómetros se conectan como reóstatos (dos terminales usados).

 

 

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