El circuito que se muestra fue sugerido por Analog Devices (www.analog.com) en su Nota de aplicación AN-411 y consiste en un circuito en el que la frecuencia de salida varía directamente con la aceleración aplicada al sensor. Este circuito se muestra en la figura. El suministro se puede hacer con voltajes de fuente única entre 9 V y 12 V. El sensor es un ADXL05 de +/- 5g que convierte cualquier aceleración aplicada directamente a una tensión de voltaje. Esta tensión se aplica luego a un AD654 que consiste en un convertidor de frecuencia en tensión de bajo costo. La tabla al lado del diagrama proporciona los valores de los componentes para diferentes rangos de frecuencia de salida. En esta tabla también tenemos el desglose de la aceleración en términos de Hertz / g. La tensión de salida en el pin 8 del ADXL05 es +2.5 V sin aceleración, y varía de 200 mV por encima o por debajo de este valor por cada 1 g de aceleración detectada. En el mismo diagrama tenemos las fórmulas que permiten calcular los componentes para obtener características específicas para el proyecto. En el diseño, los resistores deben ser precisas y R1a debe ser aproximadamente el 50% del valor de R1b. Los resistores de alta precisión pueden usarse para la calibración y luego cambiarse a tipos con una tolerancia del 1%.

 

Convertidor de aceleración de frecuencia
Convertidor de aceleración de frecuencia

 

 

 

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