El circuito mostrado en la figura es sugerido por Texas Instruments (www.ti.com) y se basa en un amplificador operacional TLV2471. Evidentemente, el circuito también puede ser implementado con amplificadores equivalentes. La principal característica de este tipo de amplificador es la producción de una señal senoidal de salida, cuya frecuencia depende de la red RC serie / paralelo. La frecuencia generada puede ser calculada por la fórmula:

f = 1 / 2πRC donde:

f = frecuencia en hertz

R = resistencia en ohms

C = capacitancia en Farads

Con los valores de los componentes mostrados en la figura, el oscilador operará en una frecuencia del orden de 1,65 kHz, un poco diferente del valor calculado que es de 1,59 kHz, debido a las tolerancias de los propios componentes. Observe que la fuente de alimentación debe ser simétrica. Una forma de implementar una retroalimentación no lineal en este tipo de circuito para reducir la distorsión de la señal generada es sustituir el resistor R6 por algún tipo de dispositivo que presente una característica corriente / tensión no lineal. Una solución muy adoptada en este tipo de circuito consiste en utilizar una lámpara incandescente común en esa función. Sin embargo, las características de esta lámpara deben ser rigurosamente elegidas para que los resultados deseados sean obtenidos.

 


 

 

 

 

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