Este simple circuito puede ser instalado en el balcón de su casa para facilitar el accionamiento de la luz por un imán que muchas veces ya está en el llavero del automóvil. Con un toque del imán en el sensor oculto, la lámpara se enciende y permanece hasta que pueda apagarse por el interior.

   Nada peor que intentar encontrar las llaves y luego el agujero de una cerradura en la oscuridad. Con el aparato descrito en este artículo este problema es contornado por el accionamiento de una luz en su balcón por un pequeño imán (el de la alarma del automóvil).

   Este sistema tiene la ventaja de que el interruptor puede estar oculto en lugar que sólo los propietarios de la casa saben.

   La alimentación del circuito se puede hacer con tensiones de 110 V o 220 V y admite lámparas de 5 a 100 vatios.

   Otro punto importante a ser observado en el uso de este circuito es que representa ahorro de energía, ya que la luz no necesita quedarse encendida todo el tiempo en que el dueño esté fuera.

 

  CARACTERÍSTICAS

Tensión de alimentación: 110 / 220 Vc.a.

Potencia controlada: 100 watts

Consumo en reposo: menor que 1 W.

   

Cuando SL se cierra el capacitor C1 se carga prácticamente con la tensión de pico de la red de alimentación. El SCR se encuentra en estas condiciones apagado.

   El accionamiento del SCR es hecho por un reed-switch conectado a su comporta.

   Una corriente muy pequeña es necesaria para el accionamiento del SCR en este circuito.

   Cuando el reed-switch es accionado por la aproximación de un pequeño imán, un pulso de corriente es suficiente para conectar el SCR que alimenta la luz de balcón.

   Como el circuito es alimentado por corriente continua gracias a la presencia de D1 y C1, incluso después de que el imán es alejado del reed-switch el SCR permanece conectado accionando así la lámpara.

   Para apagar la lámpara hay que apagar S1. La lámpara de neón indica que el circuito está alimentado.

   En la figura 1 tenemos el diagrama completo del aparato.

 

   Figura 1 - Diagrama completo del aparato
   Figura 1 - Diagrama completo del aparato | Haga click en la imagen para ampliar |

 

 

En la figura 2 tenemos su placa de circuito impreso.

 

Figura 2 - Placa para el montaje
Figura 2 - Placa para el montaje | Haga click en la imagen para ampliar |

 

   

El diodo D1 debe ser el 1N4004 si la red es de 110 V y 1N4007 si la red es de 220 V.

   El capacitor C1 debe tener una tensión de trabajo de al menos 250 V si la red es de 110 V y 400 V si la red es de 220 V.

   En realidad, el valor de este capacitor no es crítico, pudiendo quedar entre 4,7 y 50 uF. Los resistores son de 1/8 W con un 5% de tolerancia y la lámpara de neón puede ser de cualquier tipo.

   El SCR debe tener sufijo B si la red es de 110 V y sufijo D para una red de 220 V, en el caso del TIC106, este componente debe montarse en un radiador de calor.

   El reed-switch puede ser de cualquier tipo sensible y montado bajo cualquier objeto tino que no sea de metal, para permitir la acción del imán por el lado externo.

   Los hilos que van al reed-switch pueden ser finos, pero deben ser encapados.

   El fusible es importante para proteger el circuito si D1 o C1 se entre en corto.

   Para probar basta acercar un pequeño imán de X2 que debe accionar la lámpara. La lámpara debe permanecer encendida hasta que se apague S1.

   Para instalar, asegúrese de que el reed-switch quede en posición que pueda ser accionado fácilmente por el ima de su llavero.

 

Semiconductores:

SCR - TlC106B o D, o C106-4 o 6 - ver el texto

D1 - 1N4004 o 1N4007 - ver el texto

 

Resistores: (1/8 W, 5%)

R1 - 1 M ohms

R2 - 100 k ohms

R3 - 10 k ohms

 

Capacitores:

C1 - 10 uF x 250 V o 400 V - electrolítico - ver el texto

 

Varios:

F1 - fusible de 2 A

X1 - 5 a 100 W - lámpara incandescente común

X2 - reed-switch

S1 -interruptor simple

NE-1 - NE-2H- o equivalente -lámpara neón

 

Varios:

Placa de circuito impreso, radiador de calor para el SCR, hilos, soldadura, soporte para el fusible, etc.

 

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