El ruido emitido por este pequeño oscilador de bajo consumo ahuyenta a la hembra de los mosquitos que es quien pica. Alimentado por pilas o batería se puede mantener conectado permanentemente, ya que la corriente drenada es extremadamente baja.

   Los estudios revelan que el ruido producido por un mosquito femenino que es el único que pica, ahuyenta otras hembras de la misma especie. Así, osciladores que imitan tales insectos han sido usados casi universalmente como "espanta mosquitos".

   Evidentemente, su eficiencia depende de diversos factores que deben ser tenidos en cuenta en el montaje como, por ejemplo, la especie de mosquito que se pretende espantar, las condiciones de operación y, por supuesto (usando un poco de sentido del humor), esperando que no hay entre ellos algún "sordo" que no oiga el aparato ...

   Nuestro proyecto consiste en un oscilador de audio de ultra bajo consumo, pues utiliza un circuito integrado CMOS, y que alimenta un transductor piezoeléctrico.

   Alimentado por pilas, el consumo estará entre 0,5 y 2 mA, lo que garantiza la durabilidad extremadamente grande para las pilas o la batería, incluso estando el oscilador permanentemente conectado.

   Un ajuste de frecuencia permite encontrar el tono que tenga más efecto sobre los insectos.

 

  Características:

Tensión de alimentación: 3 a 9 V (pilas o batería)

Consumo: 0,5 a 2 mA

Frecuencia: 500 a 5 000 Hz (ajustable)

 

   La base del circuito es un integrado TLC7555, que consiste en la versión CMOS del conocido temporizador 555.

   Lo que caracteriza esta versión es su bajísimo consumo, dado por la tecnología CMOS de integración.

   En nuestro caso conectamos este circuito integrado como oscilador, donde la frecuencia depende de R1, R2, P1 y del capacitor C1.

   En el trimpot P1 podemos ajustar esta frecuencia para imitar a un insecto y así obtener el efecto deseado.

   El circuito integrado excita directamente un transductor piezoeléctrico de buen rendimiento.

   En realidad, el mayor rendimiento de estos transductores está justamente entre 3 y 5 kHz, que es la banda que corresponde al sonido del golpe de alas de los insectos picadores.

   La alimentación del circuito se puede realizar con tensiones de 3 a 9 V, lo que permite el uso de pilas o batería.

   En la figura 1 tenemos el diagrama completo del Espanta Mosquitos.

 

  Figura 1 - Diagrama del espanta-mosquitos
  Figura 1 - Diagrama del espanta-mosquitos

 

   En la figura 2 tenemos la disposición de los componentes en una pequeña placa de circuito impreso.

 

   Figura 2 - Placa de circuito impreso para el montaje
   Figura 2 - Placa de circuito impreso para el montaje

 

   Instalada junto con las pilas o la batería este montaje puede ser lo suficientemente compacta para caber en una caja plástica del tamaño de un paquete de cigarrillos.

   Para el circuito integrado sugerimos el uso de zócalo DIL de 8 pines.

   El trimpot es común, para montaje vertical en placa de circuito impreso.

   El transductor es del tipo piezoeléctrico debiendo ser colocado de modo que su sonido salga de la caja.

   Los agujeros para este propósito deben ser previstos.

   Para probar el aparato basta, conectar su alimentación.

   Debe haber la emisión de un zumbido por el transductor.

   Entonces coloque P1 para que este zumbido se asemeja al golpear las alas de un insecto.

   Hecho este ajuste es sólo usar el aparato. El uso es simple: manténgalo conectado en las proximidades del lugar en que esté y los mosquitos no se aproximarán (nuevamente descartando posibilidad de haber algún sordo) ...).

 

Semiconductores:

Cl1 - TLC7555 - circuito integrado CMOS

 

Resistores (1/8 W, 5%):

R1 - 4,7 k ohms (amarillo, violeta, rojo)

R2 - 2,2 k ohms (rojo, rojo, rojo)

P1 - trimpot de 100 k ohms

 

Capacitores:

C1- 22 nF o 47 nF - cerámico o poliéster

C2 - 220 nF - cerámico o poliéster

 

Varios:

S2 - Interruptor simple

B1- 3 a 9 V - batería o pilas

X1 - Transductor piezoeléctrico

Placa de circuito impreso, caja para montaje, zócalo para el circuito integrado, soporte de pilas o conector de batería, hilos, soldadura, etc.

 

 

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