Describimos dos proyectos simples utilizando el amplificador operacional 741 como comparador en relés de luz. Los circuitos se pueden utilizar con fines didácticos o en demostraciones con montaje en matriz de contactos.

   El circuito integrado 741, un amplificador operacional de uso general, sirve para una infinidad de aplicaciones prácticas de todo tipo.

   En este artículo enseñaremos cómo usarlo como comparador de tensión en dos proyectos de sensores de luz que activan relés.

   Para saber más sobre el 741 lea los artículos ART1725 y ART1726 - Conozca el 741.

 

   El comparador de tensión

     Una de las configuraciones más usadas para los amplificadores operacionales es como comparador de tensión, con la configuración mostrada en la figura 1.

 

     Figura 1 - El comparador de tensión
     Figura 1 - El comparador de tensión

 

   En esta configuración dos resistores forman un divisor de tensión que aplica al terminal inversor del 741 una tensión de referencia.

   Cuando la tensión en la entrada no inversora está por debajo de la referencia, la salida será nula.

   Cuando la tensión en la entrada no inversora sobrepasa el valor de la tensión de referencia, la salida será positiva.

   Si las tensiones se igualan, lo que es una condición bastante difícil de obtener en algunos casos, dada la ganancia del operativo, la salida será inestable.

   En la figura 2 tenemos la curva obtenida para el 741 como comparador.

 

   Figura 2 - Característica del comparador
   Figura 2 - Característica del comparador

 

  En función de este comportamiento, podemos usar el 741 en esta configuración, para operar en circuitos sensores de luz, usando como sensor un LDR común.

   Tenemos entonces dos posibilidades que se dan a continuación:

   

Circuito 1 - Disparador por Sombra

   En este circuito, cuando hacemos sobra sobre el LDR, la tensión de entrada sube y con ello la tensión de salida, en el punto ajustado por P1, se vuelve positiva disparando el relé.

   El circuito, que funciona como relé de paso o de corte de luz, se muestra en la figura 3.

 

Figura 3 - Relé de corte de luz o de sombra
Figura 3 - Relé de corte de luz o de sombra

 

    El montaje del circuito se puede realizar en una matriz de contactos, como se muestra en la figura 4.

 

Figura 4 - Montaje del circuito 1 en la matriz de contactos
Figura 4 - Montaje del circuito 1 en la matriz de contactos

 

   El ajuste del punto de disparo se realiza en el potenciómetro que también puede ser del tipo miniatura para montaje en matriz de contactos.

   

Circuito 2 - Relé de Luz

   En este circuito tenemos el disparo del relé cuando incide la luz sobre el sensor.

   El punto de disparo se ajusta en el potenciómetro, siendo el circuito dado en la figura 5.

 

Figura 5 - Circuito del relé de luz
Figura 5 - Circuito del relé de luz

 

   El montaje en una matriz de contactos se muestra en la figura 6.

 

Figura 6 - Montaje en matriz de contactos del circuito 2
Figura 6 - Montaje en matriz de contactos del circuito 2

 

   En el montaje de los dos circuitos observe la posición del circuito integrado, del relé y del transistor.

   Los resistores son todos de 1/8 W con cualquier tolerancia y el LDR puede ser de cualquier tipo redondo común.

   

(para los dos circuitos)

CI-1 - 741 - circuito integrado

Q1 - BC548 - transistores NPN de uso general

D1 - 1N4148 - diodo de uso general

LDR - LDR redondo común

P1 - 100 k ohms - pote (o trimpot)

R1 - 47 k ohms - resistor - amarillo, violeta, naranja

R2 - 4k7 ohms - resistor - amarillo, violeta, rojo

R3 - 1k ohms - resistor - marrón, negro, rojo

K1 - Relé sensible DIL de 6 V

 

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