Esta sirena modulada fue encontrada en una documentación de 1984 y consiste en una variación del circuito anterior (CIR2302S). Este circuito, cuando se ajusta adecuadamente, imita la sirena de la policía inglesa, con sonidos cambiando de tono bruscamente, en un efecto bastante interesante. Como podemos percibir, los dos 555 están conectados en la configuración de astables, siendo el primero ajustado en una baja de frecuencia, produciendo la modulación. El capacitorr C1, de 10 uF, es responsable de la modulación que se ajusta en el potenciómetro P1. El valor de este potenciómetro puede variar entre 100 k ohms y 220 k ohms sin problemas. Mayor su valor, más lenta es la modulación que se puede alcanzar. La señal de salida del primer integrado modula el segundo a través del pin 5 de desacoplamiento. Un resistor, cuyo valor puede ser alterado experimentalmente en el rango de 8k2 a15 k ohms, determina la modulación en frecuencia del segundo oscilador. La frecuencia del segundo oscilador se ajusta en el potenciómetro de 220 k ohms y su valor medio es dado por el condensador cerámico de 100 nF. La salida de este circuito, hecha en el pin 3, también es de alta impedancia, debiendo ser usado un transistor como "controlador" para excitar directamente un altavoz. El transistor dependerá de la tensión de alimentación, como ya hemos visto en los circuitos anteriores.

 


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