Con un amplificador operacional 741 o equivalente, podemos generar señales rectangulares y dientes de sierra utilizando pocos componentes externos. El circuito mostrado en la Figura 1 requiere el uso de una fuente simétrica y su voltaje puede variar de 5 a 12 V. La frecuencia de la señal depende de R1 y C1, mientras que el ciclo de trabajo para la señal se puede ajustar por la relación entre R2 y R3 . El circuito puede generar señales de frecuencias que llegan a unos pocos cientos de kilohertz. En la Figura 1 tenemos el circuito completo del oscilador con amplificador operacional 741.

 

Figura 1 - Oscilador de circuito con el 741.

 

    Las formas de onda obtenidas en dos puntos del circuito se pueden obtener en la simulación con el osciloscopio virtual del  Multisim. Estas formas de onda se muestran en la Figura 2.

 

Figura 2 - Formas de onda en el circuito.

 

    La simulación y la netlist se pueden descargar para su uso en otros proyectos.

 

Haga clic aquí para descargar la simulación

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