El ruido blanco puede ser utilizado para pruebas de audio, en instrumentos musicales, para efectos especiales y hasta como relajante. En este artículo damos un simple generador para este tipo de señal y mostramos algunas de sus utilidades.

    El ruido blanco se caracteriza por no tener una frecuencia definida. Su espectro se extiende de extremo a extremo de la banda audible, con una distribución absolutamente aleatoria de las frecuencias y con intensidades que también varían.

   Los ejemplos de ruido blanco en la naturaleza pueden ser de los de cuando su fuente no tiene ninguna frecuencia definida de emisión.

   Así, por ejemplo, el ruido del mar, el choque de las moléculas contra el tímpano, amplificado cuando colocamos una concha en el oído, y finalmente el chido que obtenemos en un receptor de FM fuera de estación.

   Sumando las oscilaciones amortiguadas de frecuencia más alta, el ruido blanco posibilita la generación del sonido de plato en los instrumentos musicales.

   Por otro lado, modulado él puede imitar el ruido de las olas del mar, sirviendo como relajante.

   Por lo general, es fácil producir ruido blanco, como veremos en este proyecto que utiliza para este propósito un transistor común. El circuito ya contiene su amplificador que excita un altavoz, pero dependiendo de la aplicación este paso puede ser retirado o modificado.

 

  Características:

Tensión de alimentación: 12 V

Potencia de audio: 500 mW (tip.)

Consumo: 300 mA (tip)

   

La agitación térmica de los átomos del material semiconductor de la unión de un diodo o transistor libera portadores de carga aleatoriamente.

   Estos portadores crean una corriente, que depende de la temperatura absoluta del material, cuya forma de onda corresponde a un ruido blanco.

  P1 ajusta la polarización del transistor al nivel deseado de ruido.

   La ganancia del amplificador, en el caso 200, es determinada por C4, y la señal es aplicada, vía C7 al altavoz.

  En la figura 1 tenemos el diagrama del generador, que es alimentado por fuente de 12 V con al menos 500 mA, no incluida en este diagrama.

 

Figura 1 - Diagrama del generador
Figura 1 - Diagrama del generador

 

   La disposición de los componentes en una placa de circuito impreso se muestra en la figura 2.

 

Figura 2 - Placa de circuito impreso para el montaje
Figura 2 - Placa de circuito impreso para el montaje

 

   El altavoz de 8 ohms debe tener al menos 10 cm de diámetro y ser instalado en un pequeño altavoz para mayor rendimiento. Los cables de conexión a P2 deben ser blindados para evitar la captación del zumbido de 60 Hz de la red de alimentación.

  En la figura 3 tenemos una sugerencia de fuente de alimentación para este aparato.

 

   Figura 3 - Fuente de alimentación para el generador
   Figura 3 - Fuente de alimentación para el generador

 

   El transformador tiene devanado primario de acuerdo con la red local y secundaria de 12 + 12 V con 500 mA.

   El circuito integrado regulador de tensión debe estar dotado de radiador de calor.

   C1 es para 25 V y C2 a 16 V de tensión de trabajo. Los diodos admiten equivalentes, como los 1N4004, 1N4007 etc.

  Para probar el aparato basta con conectarlo a la alimentación y ajustar P1 y P2 para el nivel deseado de ruido blanco.

   Comprobado el funcionamiento basta con usarlo.

 

Semiconductores:

CI1 - LM386 - amplificador de audio

Q1, - BC548 - transistores NPN o equivalente

 

Resistores (1/8 W, 5%):

R1 - 10 k ohms

R2 - 10 ohms

P1 - potenciómetro de 1 M ohmios

P2 - potenciómetro de 10 k ohms

 

Capacitores:

C1 - 2,2 nF - cerámico o poliéster

C2 - 47 nF - cerámico o poliéster

C3. - 100 uF - electrolítico de 16 V

C4 - 10 uF - electrolítico de 16 V

C5 - 47 nF - poliéster o cerámico

C6 - 100 uF - electrolítico de 16 V

C7 - 220 uF - electrolítico de 16 V

 

Varios:

S1 - Interruptor simple

FTE - 8 ohms - altavoz

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

 

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