Este circuito fue encontrado en una documentación de 1981. El circuito produce bips intervalados sirviendo para Se utilizan dos osciladores, siendo uno de audio que determina la tonalidad de los bips en que el capacitor C1 es responsable del efecto obtenido, y un oscilador de frecuencia más bajo que determina los intervalos entre los bips. En este, el componente responsable del efecto es C2. La alimentación del circuito se realiza por una tensión de 6 V que puede obtenerse de 4 pilas comunes conectadas en serie. En los dos osciladores tenemos controles que permiten cambiar la tonalidad del sonido en una amplia gama, y también los intervalos de los bips. Estos componentes son los potenciómetros R2 y R3. El autor usó en su montaje originalmente transistores del tipo 2SB77 que son PNP de germanio y PE107 que son NPN de silicio. Sugerimos que en lugar de los 2SB77 se utilizan los equivalentes modernos de silicio como los BC557 o BC558 y en lugar de los PE107 los BC547 o BC548. El altavoz es de 8 ohms de cualquier tamaño.

 


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