Alarma de Luz (CIR093S)

Written by: Newton C. Braga
Category: Banco de circuitos

En una configuración semejante a la anterior (CIR092S) tenemos una alarma o circuito de disparo para sensor resistivo (LDR o NTC) que actúa sobre un relé. La disminución de la resistencia del sensor provoca la elevación de la tensión de compuerta Nevada al umbrat por el ajuste del trimpot. Con esto, el SCR dispara y así permanece indefinidamente, energizando la bobina del relé. Un flash de luz o una súbita elevación de la temperatura del sensor puede disparar el sistema. En el caso del LDR, evidentemente, la rapidez de acción es bastante mayor que en el caso del NTC. Usamos un relé para 12V y alimentamos el circuito también con 12V. Los 2V de caída en el SCR no perjudican la actuación del relé. 

 


 

 

 

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Banco de Circuitos

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