Este montaje tiene un efecto muy interesante despertando la curiosidad de las personas. Con ella, encendimos una lámpara con un fósforo y apagamos con un soplo. El circuito es simple, y manejado con habilidad puede significar muchos puntos al lector como mágico.

   La idea básica de este proyecto se muestra en la figura1.

 

   Figura 1 - Principio de funcionamiento
   Figura 1 - Principio de funcionamiento

 

   En un cajón en el que instalamos una lámpara incandescente común, colocamos un LDR de modo que pueda recibir la luz de la propia lámpara que controla.

   El LDR es un sensor, y cuando recibe luz dispara un circuito que controla la lámpara.

   Manteniendo inicialmente el LDR posicionado de modo que tampoco reciba la luz ambiental, la lámpara permanece apagada.

   Sin embargo, cuando encendemos un fósforo en sus proximidades, pero que para las personas que están viendo el experimento, se está acercando a la lámpara, la lámpara se enciende.

   La luz de la lámpara realimenta entonces el circuito, manteniéndolo encendido, de modo que el fósforo puede ser borrado o alejado.

   Para apagar colocamos las manos como muestra la figura cerca de la lámpara y, al mismo tiempo, soplamos.

   La mano cubrirá la luz que incide en el sensor, de modo que la lámpara apaga, pero como soplamos al mismo tiempo, la gente pensará que fue nuestro soplo que la apagó.

   El control de la pequeña lámpara incandescente de 15 a 40 W es hecho por un SCR y el circuito funciona tanto en la red de 110 V como 220 V.

   

Montaje

   En la figura 2 tenemos el diagrama completo de la lámpara mágica.

 

   Figura 2 - El diagrama de la lámpara mágica
   Figura 2 - El diagrama de la lámpara mágica

 

   El montaje se puede realizar en un pequeño puente de terminales con la disposición mostrada en la figura 3.

 

   Figura 3 - El aspecto del montaje
   Figura 3 - El aspecto del montaje

 

   El SCR debe tener sufijo B o D si la red es de 110 V y sufijo D si la red es de 220 V.

    Para lámparas de hasta 40 W, el SCR no necesitará disipador. No recomendamos lámparas mayores, por el calentamiento excesivo que puede quemar a la persona que la toque en el momento de apagar.

   El LDR es de tipo redondo común y los resistores son de 1/8 W.

  En la figura 4 tenemos el modo correcto de posicionar el LDR en relación al agujero de la caja.

 

   Figura 4 - Posicionamiento del LDR
   Figura 4 - Posicionamiento del LDR

 

   

Prueba y uso

  En primer lugar, conecte el aparato a la red de energía y mantenga el agujero del LDR tapado.

   Ajuste el trimpot para que quede en el umbral del punto en que la lámpara se encienda.

   Descubre el agujero. La lámpara debe encenderse.

    Vuelva un poco el ajuste para que, con la iluminación ambiente o apagando la lámpara su sobra impida que se encienda.

   Para usar, coloque el aparato de modo que la lámpara apagada haga sombra sobre el agujero o que no reciba directamente la luz ambiental.

   Aproximando el fósforo como muestra la figura 5 la lámpara debe encenderse.

 

   Figura 5 - Encendiendo la lámpara
   Figura 5 - Encendiendo la lámpara

 

  Después, cubriendo la lámpara con las manos y soplando, al mismo tiempo que la sombra incida sobre el LDR, la lámpara debe apagarse.

   

SCR- TIC106B o D - ver texto

D1 - 1N2002 - diodo de silicio

LDR - LDR común

P1 - 47k ohms- trimpot

L1 - 25 a 60 W - lámpara incandescente

R1 - 56 k ohms x 1/8 W - resistor - verde, azul, naranja

R2 - 47 k ohms x 1/8 W - resistor - amarillo, violeta, naranja

R3 - 4k7 x 1/8 W - resistor - amarillo, violeta, rojo

R4 - 10 k ohms x 1/8 W - resistor - marrón, negro, naranja

Varios:

Puente de terminales, cable de fuerza, caja para montaje, zócalo para la lámpara, hilos, soldadura, etc.

 

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