El micrófono de este aparato capta cualquier sonido y dispara un relé manteniéndolo cerrado por el tiempo que ajuste. Usted puede utilizar el circuito para controlar los automatismos o como alarma. Simple de montar, utiliza componentes comunes.

   Vox o Relé de sonido es un aparato de gran utilidad en diversas aplicaciones y ya hemos descrito varios de ellos en nuestras aplicaciones. El circuito que presentamos tiene por diferencial la temporización que puede ser ajustada entre algunos segundos hasta varios minutos, dependiendo de su utilización.

   El micrófono utilizado es muy sensible, pudiendo incluso emplearse un detector de impactos en cuyo caso el aparato puede ser utilizado como una alarma de vitrina.  El circuito puede ser alimentado por pilas y como tiene un consumo muy bajo en la condición de espera, ellas tendrán gran autonomía.

 

 

Como funciona

En la figura 1 tenemos un diagrama de bloques del aparato.

 

 

  Figura 1 - Diagrama de bloques de Vox
  Figura 1 - Diagrama de bloques de Vox | Clique na imagem para ampliar |

 

  

En la entrada tenemos un amplificador de alta ganancia con dos transistores en la configuración de Darlington.  El micrófono se conecta a la base, de modo que la señal amplificada aparezca en el colector del segundo transistor.

   El potenciómetro P1 es un ajuste de sensibilidad que determina el nivel de sonido que provoca el disparo del circuito. La señal del colector del preamplificador se aplica al pin de un circuito integrado 555 conectado en la configuración de monoestable.

   El ajuste de P2, junto con R4 y C3 determina el tiempo que el 555 se mantendrá disparado, con su salida llevada al nivel alto. Esta salida excita el tercer bloque que consiste en un transistor que controla un relé.

   Los contactos del relé se pueden utilizar para controlar una carga externa como un equipo, lámparas, un electrodoméstico o una sirena de alarma.

   

 

Montaje

   En la figura 2 tenemos el diagrama completo del Vox Temporizado.

 

Figura 2- Diagrama de Vox
Figura 2- Diagrama de Vox | Clique na imagem para ampliar |

 

   

La placa de circuito impreso para el montaje se muestra en la figura 3.

 

   Figura 3 - Placa de circuito impreso para el montaje
   Figura 3 - Placa de circuito impreso para el montaje | Clique na imagem para ampliar |

 

  

Los electrolíticos pueden ser para 6 v o más y el relé de cualquier tipo con corriente de 100 mA.  El montaje prevé el uso de un tipo DIL, pero si la base es diferente, debe ser alterada.

   Los resistores son todos de 1/8 W y el micrófono puede ser dinámico o piezoeléctrico. En la figura 4 tenemos una opción de fuente de alimentación para el circuito, usando un regulador 7806.

 

   Figura 4 - Fuente de alimentación para Vox
   Figura 4 - Fuente de alimentación para Vox | Clique na imagem para ampliar |

 

   

Para utilizar un micrófono de electreto debemos añadir un resistor de polarización, como muestra la figura 5.

 

 

Figura 5 - Uso del micrófono de electreto
Figura 5 - Uso del micrófono de electreto

 

   Si el micrófono se aleja del aparato, se debe utilizar un cable blindado.

   

 

Prueba y uso

   En la figura 6 tenemos el modo de conectar un LED al relé para verificación y ajuste del funcionamiento.

 

Figura 6 - Circuito de prueba
Figura 6 - Circuito de prueba

 

   

Conecte la unidad colocando inicialmente P2 en la posición de mínima resistencia (menor tiempo). Después vaya hablando y ajustando P1 hasta que el circuito dispare.

   Deje de hablar y vuelva un poco ese ajuste para que el relé se apague. Hablando ahora, el relé debe disparar.

   Encuentre el punto de mayor sensibilidad y ajuste P2 para que el relé quede disparado por el tiempo deseado.

   

 

Lista de material

CI-1 - 555 - Circuito integrado

Q1, Q2 - BC548 - transistores de uso general

D1 - 1N4148 - diodo de uso general

K1 - Relé de 6 V x 100 mA (Metaltex)

P1 - 4,7 M ohms - potenciómetro

P2 - 1 M ohms - potenciómetro

S1 - Interruptor simple (conjugado a P1)

B1 - 6 V - 4 pilas o fuente

C1 - 100 nF - capacitor de cerámica o poliéster

C2 - 10 uF - capacitor electrolítico

C3 - 100 uF - capacitor electrolítico

C4 - 10 nF -capacitor cerámico o poliéster

C5 - 1 000 uF x 12 V - capacitor electrolítico

R1 - 100 k ohms - resistor - marrón, negro, amarillo

R2 - 22 k ohms - resistor - rojo, rojo, naranja

R3 - 47 k ohms - resistor - amarillo, violeta, amarillo

R4 y R5 - 10 k ohms - resistores - marrón, negro, naranja

Varios:

Fuente o soporte de pilas, placa de circuito impreso, caja para montaje, jack para el micrófono, micrófono, hilos, soldadura.

 

 

 

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