En el circuito presentado el sensor puede ser formado por una plaquita de circuito impreso como el estándar indicado, dos pequeñas varillas o dos pantallas de metal teniendo entre ellas un pedazo de tejido. La presencia de humedad reduce su resistencia haciendo que el circuito detecte este cambio y active el relé. La alimentación se realiza con una tensión de 12 V y otros amplificadores operacionales se pueden utilizar. También se pueden utilizar comparadores de tensión como el LM339. La sensibilidad del circuito se determina por el resistor de 12M. Los resistores entre 1 M y 22 M pueden ser experimentados según la aplicación. El cable hasta el sensor debe ser corto y, si es largo, debe ser blindado para que la captación de zumbidos no provoque el disparo errático del relé. Para evitar problemas de disparo con ronquido, principalmente si el circuito es alimentado por fuente, conecte un condensador de 10 uF del pin 2 a la tierra. Nunca utilice fuente sin transformador para alimentar este circuito. La fuente debe tener al menos 250 mA de capacidad de corriente.

 


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