Este circuito es de una publicación de 1982. ¿Qué tal despertar con los primeros rayos de sol? No, usted no necesita un buen gallo para eso! El circuito que damos aquí hace las veces del gallo y te despierta con la claridad del amanecer, accionando una alarma, su radio de cabecera o sea lo que quieras. Un LDR es el elemento sensible que, al recibir los primeros los rayos del alba, acciona un relé. El relé se puede entonces utilizar para conectar cualquier dispositivo que el lector desee. Simple de montar y de gran eficiencia, este aparato puede permanecer encendido toda la noche sin peligro de desgaste para las pilas, en vista de su bajo consumo.

   Los componentes pueden ser soldados en un puente de terminales que sirve como chasis. El LDR quedará en un tubo colocado fuera de su casa o en un lugar que reciba sólo la luz del amanecer. Usted debe tener cuidado de que la luz de un poste de iluminación o de otra fuente no interfiera en el funcionamiento del aparato. El potenciómetro de 47 k controla la sensibilidad del circuito y, por lo tanto, la intensidad de luz con que se produce el disparo. Este potenciómetro se debe ajustar para el punto en que, incluso en días encubiertos, se obtenga el disparo del relé. El relé sugerido es el ZA 020 006, ya que la alimentación del circuito se realiza con 4 pilas comunes (6 V). Para excitar el relé a partir de la pequeña corriente del LDR, se utiliza un transistor PNP de uso general que puede ser el 2SB186, BC557 o el BD136. Una característica interesante de este circuito es la clave "día" - "noche". En la posición "día" tenemos la conexión del circuito externo al anochecer, es decir, un interruptor crepuscular. En la posición "noche" tenemos la conexión del circuito externo al amanecer. que interpreta de otro modo, en la posición "día" tenemos la acción de apagar un circuito externo al amanecer, y en la posición "noche" tenemos la acción de apagar un circuito externo al anochecer. El lector puede percibir que además de despertador este circuito puede ser usado en otras aplicaciones como alarma de luz.

 


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