El circuito es simple, pues utiliza sólo un transistor y un relé que puede ser el MC2RC1 o MC2RC2 (o equivalente), conforme la tensión de alimentación sea de 6 o 12 V. Con 12 V el circuito tendrá mayor sensibilidad, la cual es ajustada en el potenciómetro P1. Este es un detector de luz, en el que el relé se activa con la incidencia de luz en el fotosensor. El fotosensor original es un TIL78, pero cualquier equivalente debe funcionar satisfactoriamente, incluso, como experimentamos, un 2N3055 sin el casco de protección. El diodo en paralelo con el relé sirve de protección para el transistor, evitando que la alta tensión generada en la conmutación lo dañe. El foto-transistor TlL78 presenta una resistencia mayor que 1 M en la oscuridad y menor que 50 k en la iluminación con lámpara incandescente de 100 W a 3 metros de distancia. El circuito también funcionará satisfactoriamente si, en lugar del foto-transistor, se utiliza un LDR. Simplemente cambie el potenciómetro de 100 k a 1 M por uno de 47 k.

 


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