¿Su sensible amplificador de audio capta estaciones de AM? ¿Su sistema de audio re- produce algunas señales extrañas de estaciones de radio, señales telegráficas o incluso comunicaciones de policía o aviones? No se trata de un fenómeno "paranormal" y si algo bastante común, aunque incómodo. Tiene explicaciones simples y puede también ser eliminado de manera sencilla.

Los circuitos de audio sensibles pueden captar señales de frecuencias elevadas (RF) y detectarlos con la superposición a la seria] que se debe reproducir. Este fenómeno recibe el nombre de "audio rectificación" y ocurre principalmente en las etapas de mayor ganancia como, por ejemplo, las que trabajan con fonocaptores magnéticos o cabezas lectoras de tape-decks.

Si al colocar su aparato de audio en la posición de tocadiscos o tape-deck y sin ninguna señal (cinta o discos) usted oye el sonido bajito (o incluso alto) de alguna radio de AM o incluso las comunicaciones de alguna estación de VHF (policía o aviones) de las proximidades, es sena] que el problema existe. Si en las proximidades de su casa existe algún radioaficionado. también será posible que sus señales se oigan en su aparato de audio.

 

Qué ocurre

La señal es captada por el cableado del aparato o entra por la propia red de alimentación, que actúa como antena, llegando entonces al primer transistor amplificador. La juntura base/emisor de este primer transistor actúa para esta serial como un diodo detector, rectificando la sena] con la extracción de 1a envolvente que es la modulación.

El resultado es que "sobra" en el circuito la modulación, o sea la parte de audio de la señal captada, que entonces será fácilmente amplificada por las etapas siguientes del aparato. Pero no es sólo el primer transistor e] que puede detectar las señales de radio captadas por su aparato de sonido. Soldaduras mal hechas y blindajes indebidamente puestos a tierra también pueden ayudar en la captación y detección de las señales, debiendo ser analizadas en el caso de la ocurrencia del fenómeno.

 

Cómo eliminarlo

Además de una verificación en las soldaduras de los cables de entrada de señal existen algunas soluciones relativamente simples para el problema en cuestión principalmente para los lectores que viven cerca de fuentes de seriales fuentes (antenas de estaciones de AM o servicios públicos) (figura 1).

 

Figura 1
Figura 1

 

La primera solución consiste en la conexión de un capacitor cerámico en paralelo con la entrada. el cual ofrecerá una baja impedancia para la serial captada, desviándola hacia tierra. El valor de este capacitor debe ser obtenido experimentalmente y estará en banda de 10 a 220 pF. No se deben usar valores mayores pues afectan también la señal de audio que se debe amplificar.

Otra solución, que puede usarse en conjunto con el capacitor, consiste en la utilización de un choque con núcleo de ferrite en serie con la entrada de la serial lo más próximo posible de la base del primer transistor amplificador (o integrado) que puede actuar como detector. El valor de este componente estará alrededor de 10 µH.

En la figura 2 tenemos una sugerencia de circuito de National para el caso especifico del LM381 con un capacitor de 20 a 200 pF y un choque de RF de aproximadamente 10 µH.

 

Figura 2
Figura 2

 

La tercera solución. para el caso de que la serial entre via la red de alimentación, consiste en conectar entre los dos cables un capacitor de ‘100 nF x 600 V. Este capacitor puede ser de poliéster.

 

 

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