Los recursos de audio de un computador permiten su utilización como inyector de seriales o incluso generador de audio en el taller. Basta aprovechar la salida, que es capaz de excitar la entrada de prácticamente cualquier amplificador, y rodar un programa que produzca los sonidos de las frecuencias y formas de onda que se pretende usar en una prueba.

Las señales de audio generadas por el computador pueden ser usadas en la prueba de diversos tipos de equipamientos de sonido, tales como radios, amplificadores, intercomunicadores, etc.

El computador posee una salida, para conexión de un amplificador externo, que provee serial de excelente nivel para pruebas de aparatos de audio. Con la utilización de un sistema de aislación a través de capacitores, y un trimpot, que permite ajustar la intensidad de la señal, podremos usar los comandos del aplicativo para generar sonidos de las frecuencias necesarias para las pruebas.

Está claro que, en una prueba más sofisticada, podemos hasta elaborar programas que generan gamas enteras de señales para pruebas, verificando así curvas de respuesta, distorsiones o eventuales problemas de funcionamiento de circuitos de audio.

En la figura 1 tenemos el diagrama esquemático del circuito, que por ser extremadamente simple puede ser montado en un pequeno puente de terminales.

 


 

 

 

Montaje

En la figura 2 damos una sugerencia de montaje en puente de terminales.

Para la conexión del circuito al computador y al aparato a prueba será conveniente Ia utilización de cables blindados.

La pinza cocodrilo deberá ser conectada a la masa de los aparatos probados.

 

Prueba y uso

Papa probar el aparato conecte la pinza cocodrilo a la tierra de un amplificador y la punta de prueba a su entrada.

El enchufe RCA debe ir a la salida AUDIO de lo computador. Un aplicativo que genere sonidos debe entonces ser cargado.

P1 – trimpot 10 kΩ

C1, C2 e C3 – 10 nF – Capacitor cerámico o de poliéster

Varios:

Punta de prueba, pinza cocodrilo, alambres, soldadura, caja para montaje, puente de terminales, enchufe RC, etc.

 

 

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