Un pequeño sistema de control remoto puede ser de gran utilidad para accionar una grabadora, un dispositivo de llamada de atención como, por ejemplo, una sirena, o un transmisor para escuchar conversaciones.

Este artículo fue publicado en mi libro de espionaje de la década de los 80 y luego actualizado en 2015.

   El detective puede contar en su maleta de "utilidades" con un sistema simple temporizado de múltiples usos, capaz de operar por rayos infrarrojos en un radio de hasta 20 metros dependiendo del lugar.

   El sistema se compone de un pequeño transmisor que cabe en el bolsillo y funciona con una batería de 9 V y un receptor que funciona con pilas y se puede conectar a cualquier automatismo.

   En la figura 1 tenemos el diagrama del transmisor.

 

Figura 1 - Diagrama del transmisor infrarrojo
Figura 1 - Diagrama del transmisor infrarrojo

 

 

   Como podemos ver por el circuito, el transmisor genera un tren de pulsos de radiación infrarroja que será irradiada y reconocida por el circuito receptor.

   El receptor tiene su circuito mostrado en la figura 2.

 

Figura 2 - Diagrama del receptor
Figura 2 - Diagrama del receptor

 

 

La disposición de los componentes en una placa de circuito impreso se muestra en la figura 3.

 

Figura 3 - Placa del receptor
Figura 3 - Placa del receptor

 

 

   Un amplificador reconoce la radiación modulada usando para ello un foto-transistor como sensor. Esta señal se aplica a la entrada de un circuito monoestable cuando se reconoce y con ello provoca el disparo del relé por un tiempo que podemos ajustar.

   Hay dos ajustes en este circuito:

   P1 ajusta la sensibilidad del circuito al disparo, en función de la iluminación ambiental. P2 ajusta el tiempo que el relé permanece accionado después del disparo del transmisor. Este tiempo puede ajustarse para quedarse entre unos segundos y más de media hora.

   Para operar el aparato y ajustarlo, apunte el transmisor al receptor y ajuste P1 para máxima sensibilidad. P2 debe estar en la posición de menor tiempo para este ajuste. El receptor debe recibir sólo la iluminación del transmisor y se debe evitar la iluminación de las lámparas fluorescentes que pueden causar el disparo errático.

 

 

a) TRANSMISOR

SEMICONDUCTORES

Q1 - BC547 o equivalente de transistores NPN de uso general

Q2 -BC558 o equivalente - transistores PNP de uso general

LED1 - Led infrarrojo

 

RESISTORES

R1 - 47 k - resistor (amarillo, violeta, naranja)

R2 - 1 k - resistor (marrón, negro, rojo)

R3 - 10 ohmios - resistor (marrón, negro, negro)

 

CAPACITORES

C1 - 47 nF - capacitor de cerámica o poliéster

C2 - 100 uF - capacitor electrolítico

 

VARIOS

B1 - 9 V - batería

S1 - Interruptor de presión

Caja para montaje, placa de circuito impreso, conector para batería, tíos, soldadura, etc.

 

 

b) RECEPTOR

SEMICONDUCTORES

Q1 - Foto-transistores para infrarrojos

Q2 y Q3 - BC547 o equivalente - transistores NPN de uso general

D1 - 1N914 o equivalente - diodo de silicio

CI-1 - 555 - circuito integrado

 

RESISTORES

P1 - 1 M - potenciómetro

P2 - 1 M o 2,2 M - potenciómetro

R1 - 10 k - resistor (marrón, negro, naranja)

R2 - 47 k - resistor (amarillo, violeta, naranja)

R3 - 4,7 k - resistor (amarillo, violeta, rojo)

R4 - 1 k - resistor (marrón, negro, rojo)

 

CAPACITORES

C1 - 10 uF - capacitor electrolítico

C2 - 1 000 uF - capacitor electrolítico

C3 - 100 uF - capacitor electrolítico

 

VARIOS

K1 - Relé de 6V x 100 mA o menos

B1 - 6 V - 4 pilas pequeñas

S1 - Interruptor simple

Placa de circuito impreso, caja para montaje, soporte de pilas, cables, soldadura, etc.

 

 

 

 

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