En nuestro sitio y en nuestras publicaciones tenemos decenas de circuitos de alarmas, para todo tipo de aplicación, ya sea en la protección doméstica como de edificios comerciales e industriales. Sin embargo, todos necesitan una sirena y en algunos casos no se da en el proyecto. En este artículo, describimos el montaje de una buena sirena para alarmas.

   La sirena que describimos en este artículo genera sonidos intercalados, similares al de un vehículo de policía con volumen intenso.

   El volumen final depende de la etapa de salida del circuito que puede ser el original, para algunos watts o el paso Darlington, mostrado en la figura 1, para una potencia mayor.

 

   Figura 1 - Etapa de alta potencia
   Figura 1 - Etapa de alta potencia

 

    El circuito puede ser alimentado por tensiones de 6 a 12 V con un consumo que depende de la potencia de salida.

   Para la versión original este consumo estará entre 200 y 800 mA y para la versión de alta potencia podrá llegar a los 2 A.

   

Como funciona

   Se utilizan dos circuitos integrados 555 en la configuración asimétrica generando la intermitencia y el tono de audio.

   La intermitencia, es decir, la velocidad de los pulsos es generada por CI-1 dependiendo del condensador C1 y del ajuste de P1.

   Este circuito controla un oscilador de audio con el otro 555, que genera la señal de audio.

   El control es hecho por el pin 4, que llevado al nivel alto habilita el integrado que entonces oscila en una frecuencia que depende de C3 y puede ser ajustada por P2.

   La señal de salida de CI-2 consiste entonces en pulsos de sonido intervalados que se aplican al paso amplificador.

   En la versión original, el paso consiste en un transistor de potencia TIP31 que tiene por carga de colector un altavoz.

   La intensidad del sonido obtenido depende de la calidad de este altavoz que debe tener al menos 10 cm de diámetro y ser del tipo pesado.

   Para mayor potencia, se puede utilizar el paso con dos transistores que describimos en la figura 1.

 

   Montaje

   El diagrama completo de la sirena se muestra en la figura 2.

 

Figura 2 - Diagrama de la sirena
Figura 2 - Diagrama de la sirena

 

   El montaje se puede realizar en una placa de circuito impreso con el patrón mostrado en la figura 3.

 

Figura 3 - Placa de circuito impreso para el montaje
Figura 3 - Placa de circuito impreso para el montaje

 

   Los capacitores electrolíticos son para 25 V o más y los demás pueden ser cerámicos o de poliéster.

   El transistor de potencia debe estar dotado de un disipador de calor.

   

Prueba y uso

   Para probar la sirena, basta con conectarla a una fuente de alimentación de 6 a 12 V, según la aplicación.

   Comprobado el funcionamiento, su conexión al relé de un sistema de alarma debe ser hecha conforme muestra la figura 4.

 

   Figura 4 - Uso de la sirena en una alarma
   Figura 4 - Uso de la sirena en una alarma

 

   Ajuste P1 y P2 para obtener los sonidos deseados.

   

CI-1, CI-2 - 555 - circuitos integrados

Q1 - TIP31 - transistores NPN de potencia

P1, P2 - 100k ohms - trimpot

FTE - 4 ó 8 ohms - altavoz (ver texto)

R1, R3 - 10 k ohms x 1/8 W - resistores - marrón, negro, naranja

R2 - 12 k ohms x 1/8 W - resistor - marrón, rojo, naranja

R4 - 1 k ohms x 1/8 W - resistor - marrón, negro, rojo

R5 - 4k7 ohms x 1/8 W - resistor - amarillo, violeta, rojo

C1 - 22 uF - electrolítico

C2, C3 y C4 - 100 nF - poliéster o cerámico

C5 - 100 uF - electrolítico

Varios:

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

 

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