Tenemos aquí un proyecto muy interesante encontrado en una publicación de 1982. Por el funcionamiento del circuito los lectores podrán percibir fácilmente su utilidad. Viene un coche en sentido contrario al suyo, y usted está con la luz alta. El coche en sentido contrario le señala, pidiendo que bajar la luz. Usted está obligado a accionar el control de cambio de luz. En un viaje prolongado, el número de veces en que esta operación debe ser hecha es algo que debe tenerse en cuenta, pues se vuelve desagradable después de cierto tiempo. Con el control sugerido por el autor de este proyecto, el cambio de luz alta a baja se realiza automáticamente con la acción de la luz del coche que viene en sentido contrario. El circuito completo se muestra en la figura y tiene por elemento básico un LDR. Este LDR se coloca en un tubo opaco apuntado hacia delante del coche para recibir la luz del faro del vehículo que viene en sentido opuesto, como se muestra en la figura adicional. Un control de sensibilidad permite obtener el punto ideal del disparo del circuito. Con la acción de la luz sobre el LDR una corriente de base mayor aparece en el transistor, teniendo como consecuencia la acción sobre el relé que cierra sus contactos. En esta acción tenemos la conmutación de la luz. El relé se mantiene cerrado por el tiempo en que la luz del faro del carro en sentido opuesto actúa sobre el LDR un poco más, determinado por el capacitor de 2 200 uF en paralelo con el transistor. Importante en este circuito es que, estando él fuera de acción, permanece el funcionamiento normal del sistema del coche de luz alta y baja. El relé utilizado es de 12 V o 6 V, según la alimentación disponible en su coche. El transistor puede ser de cualquier tipo NPN para uso genera! de media potencia como el BCS48, BC547 o TlP29. Un zener de 9 V colocado en paralelo con la alimentación mantiene constante la tensión en el circuito, mejorando su estabilidad. El electrolítico es de 22oUF o 1 500 uF con tensión de trabajo de 16 o 25 V. El ajuste de sensibilidad se realiza en un potenciómetro de 47k el cual debe quedar en local accesible en lugar de otro en el panel. Ver que, colocando este potenciómetro al mínimo, es decir, con el cursor todo hacia el lado de la tierra, el aparato queda automáticamente fuera de acción.

 


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18.837MBMemory Usage39.28msRequest Duration
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PHP Version8.3.20
Identityguest
Response200
Templatecassiopeia
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