Este proyecto tiene por base el ART111S en que se describe el funcionamiento del circuito integrado µAA170, una escala de punto móvil.

Este proyecto, que con seguridad va a merecer la atención especial de los lectores que gustan de completar sus equipos de audio, es un VU de LEDs de tipo “punto luminoso móvil”. Un LED encendido recorre la escala de 16 de acuerdo con la música ejecutada en su aparato de audio.

Para el montaje de este sistema no es necesario ningún componente adicional, además de los que están montados en su placa base.

Una aplicación inmediata del accionador de escala µAA170 del tipo punto luminoso móvil es como VU de LEDs. En este sistema, un LED recorre la escala, de acuerdo con la intensidad de la serial de audio, permitiendo no sólo un efecto decorativo sino también una evaluación del nivel de la señal, lo que es importante en el caso de grabaciones o de sistemas estereofónicos.

Como el sistema es alimentado por una tensión de 12 voltios, nada impide que sea instalado en el automóvil, como un excelente recurso de decoración.

Para aplicaciones en sistemas de audio fijos, se debe usar una fuente de 12V como la sugerida en la introducción, utilizando el regulador 7812 o incluso zener.

Un hecho importante que se debe tener en cuenta en esta aplicación, es que la potencia de excitación exigida para el circuito es tan pequeña que hasta incluso las radiecitos de pilas y los grabadores de casetes pueden ser acoplados al VU de LEDs, con excelentes resultados!

Y si tiene un sistema estereofónico, lo ideal será montar una unidad para cada canal.

 

Montaje

El circuito para esta aplicación aparece en la figura 1.

 

Figura 1
Figura 1

 

El circuito de entrada tiene un resistor Rx que será elegido de acuerdo con la potencia de su equipamiento de audio, conforme a la siguiente tabla.

Potencia Rx
Hasta 5 watts 1k
5 a 25 W 2k2
Por arriba de 25 W 4k7

La inercia del sistema, o sea, la velocidad con que los LEDs responden a las variaciones de intensidad del sonido, son determinadas por el capacitor C1. El lector deberá experimentar, pues el “gusto" visual de cada uno puede variar.

Para responder a variaciones rápidas, C1 debe tener valores entre 4,7 µF y 22 µF. Para una respuesta más lenta. los valores deben estar entre 47 y 100 µF.

Observe en la figura 2 que el sistema está conectado en paralelo con el altoparlante del sistema de sonido.

 

Figura 2
Figura 2

 

 

Ajustes

Para ajustar el sistema, conecte su aparato de audio a un volumen medio y alimente el VU de LEDs.

Accione después sobre P1 y P2 determinando el nivel inferior y superior de encendido.

Si tiene dificultades para conseguir el ajuste en vista del exceso de sensibilidad, o también una respuesta muy rápida, altere en primer lugar a R 3, reduciendo su valor a 5k6, o incluso 4k7 (este componente depende de la potencia en que normalmente usted usa su amplificador).

Comprobado el funcionamiento sólo falta la instalación definitiva y usar su VU de LEDs.

 

(Publicado originalmente en 1987)

 

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