Investigador Infrarrojo (ART903S)

Written by: Newton C. Braga
Category: Artículos Técnicos y Proyectos

Detecte fuentes de radiación infrarroja modulada, como controles a distancia, verificando su intensidad y su origen. Este simple detector es bastante sensible y se alimenta con pilas comunes.

El detector que presentamos detecta infrarrojos modulados, reproduciendo la modulación en un pequeño altavoz.

Una de las utilidades posibles es como verificador de funcionamiento de controles remotos, como muestra la figura 1.

 

Figura 1 - Utilizando el investigador
Figura 1 - Utilizando el investigador

 

La sensibilidad del circuito es elevada, gracias al uso de un amplificador operacional de gran ganancia y un foto-transistor común como sensor.

El circuito también puede detectar otras fuentes de luz modulada, pues el sensor no responde sólo a los infrarrojos.

El sensor utilizado puede ser cualquier foto-transistor común, incluso aprovechado de viejos televisores analógicos fuera de uso con control remoto.

Para una mayor selectividad, se puede utilizar un filtro de infrarrojos que se puede encontrar en televisores antiguos delante del sensor.

En la figura 2 tenemos algunos tipos de foto-transistores comunes que se pueden utilizar en este proyecto.

 

Figura 2 - Foto-transistores comunes
Figura 2 - Foto-transistores comunes

 

 

Montaje

En la figura 3 tenemos el diagrama completo del investigador infrarrojo.

 

Figura 3 - Diagrama del investigador infrarrojo
Figura 3 - Diagrama del investigador infrarrojo

 

La placa de circuito impreso para el montaje se muestra en la figura 4.

 

Figura 4- Placa de circuito impreso para el montaje
Figura 4- Placa de circuito impreso para el montaje

 

En el montaje, observe la posición del circuito integrado, del transistor y del foto-transistor.

Los resistores son de 1/8 W con cualquier tolerancia y el capacitor electrolítico para 6 V o más.

El altavoz es pequeño y se puede utilizar una caja como la que se muestra en la figura 5.

 

Figura 5 - Caja para el montaje
Figura 5 - Caja para el montaje

 

En la figura 6 tenemos un emisor infrarrojo que se puede utilizar para probar el investigador.

 

Figura 6 - Un transmisor de infrarrojos de prueba
Figura 6 - Un transmisor de infrarrojos de prueba

 

El par se puede utilizar en un sistema de experimentación de comunicación telegráfica por infrarrojo, bastando sustituir S1 del transmisor por un manipulador.

 

CI-1- 741 - circuito integrado

Q1 - Cualquier foto-transistor

Q2 - BC548 - transistores NPN de uso general

S1 - Interruptor simple

B1 - 9 V - batería

P1 - 2M2 ohms - pote

FTE - 4 o 8 ohms - pequeño altavoz

R1, R2 - 10 k ohms - resistores - marrón, negro, naranja

R3 - 100 k ohms - resistor - marrón, negro, amarillo

R4 - 1 M ohms - resistor - marrón, negro, verde

R5 - 33 ohms - resistor - naranja, naranja, negro

C1 - 220 nF - capacitor de cerámica o poliéster

C2 - 100 uF - capacitor electrolítico

Varios:

Placa de circuito impreso, conector de batería, caja para montaje, hilos, soldadura, etc.

 

Buscador de Datasheets


N° de Componente 

Banco de Circuitos

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