Lo que presentamos es una configuración de multivibrador astable utilizando ló conocido amplificador operacional 741. Este circuito genera um señal  rectangular señal de amplitude igual a la tensión de alimentación (que no necesita ser simétrico) y en la salida del circuito RC tenemos una señal en diente de sierra.   Este circuito se muestra en la Figura 1.

Figura 1 - Configuración multivibrador

 

    El circuito puede ser alimentado con tensiones de 5 a 12 V y la frecuencia está determinada por la red de realimentación RC. En este caso tenemos una frecuencia que puede ser medido a partir de la forma de onda simulada, que aparece en el osciloscopio virtual del Multisim Blue, en la figura 2.

 

    Figura 2 - La forma de onda de salida del circuito.

 

    Dadas las características del 741 la frecuencia máxima que este circuito puede generar no excede de unas pocas decenas de kilohercios. Para modificar la frecuencia sugierese quebasta  sólo cambiar el valor del condensador.  Para un oscilador de frecuencia basta cam,biar el resistor de 1k por un potenciómetro de 1 M ohm em serie com um resistor de 1k. Sin embargo, para frecuencias más altas, se pueden utilizar amplificadores operacionales apropiados. A continuación, la simulación y la lista de conexiones para los lectores interesados ​​en trabajar en el circuito.

 

 

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