Proponemos en este proyecto, un sistema electrónico que abre y cierra los contactos de un relé a intervalos regulares y que pueden ser ajustados en una amplia pista de valores de una olla común. Con el uso de adecuados valores de capacitores se pueden obtener ciclos que varían desde unos pocos segundos o menos de un segundo a varios minutos, que amplía bastante la pista de aplicaciones prácticas para el dispositivo.

El circuito puede ser alimentado con tensiones de 6 o 12 V y la potencia de la carga, así como su tensión de alimentación dependen exclusivamente del tipo de relé utilizado en el proyecto.

Una de las posibles aplicaciones para el dispositivo podemos mencionar las siguientes:

Flash para el control de lámparas de señalización

Por ventilación o sistema de enfriamiento del motor

Unidad de sistemas de calefacción en esquema de potencia media.

 

CARACTERÍSTICAS

Tensión de alimentación: 6 ó 12 V

Corriente de carga máxima: 6 A

Tensión de la carga: 6 a 220 V

Banda de frecuencias de funcionamiento: 0,001 Hz 1 5 Hz

 

La base del proyecto es un oscilador hecho alrededor de una de las cuatro puertas NAND en gatillo existente de CMOS circuito integrado (d) el tipo de 4093.

Con solamente dos componentes externos, como se muestra en la figura 1, podemos formar un rectángulo de oscilador con un ciclo activo de aproximadamente 50%.

 

 

 Figura 1- esquema del aparato
Figura 1- esquema del aparato

 

 

Mediante el resistor variable se puede tener un control en una amplia pista de frecuencias. El oscilador en cuestión controla un buffer inversor montado en puerta otro NAN D y, por su vez, controla un transistor que controla el relé.

El resultado final es una forma muy sencilla y eficaz, con componentes de bajo costo.

El montaje está a la discreción del lector y puede ser la placa de circuito impreso o matriz de contactos.

El chip puede montarse en el zócalo, para evitar el calor en el proceso de soldadura.

El capacitor C1 que determina el tiempo de los ciclos de accionamiento tienen valores que pueden ser elegidos según la siguiente tabla, ya que debemos tener en cuenta las tolerancias de los componentes.

 


 

 

 

No recomendamos el uso de grandes capacitores de más 1000 uF, dada la posibilidad de fugas que pueden afectar el funcionamiento del circuito.

Para más tiempo será preferible aumentar a valores hasta de 1 M ohms de P1, en cuyo caso, podemos conseguir cerca de media hora como máximo ciclo para el sistema de funcionamiento.

El potenciómetro P1 es lineal o log y aún valores más grandes, como 220 k ohmios 470 k ohms o incluso puede ser utilizado.

El capacitor C1 debe ser de buena calidad, debido a pérdidas pueden comprometer el buen funcionamiento del aparato.

Para probarlo, basta con conectar la alimentación y ajustar P1. La apertura y cierre de los contactos del relé ayudarán al lector a comprobar el funcionamiento.

Se sugiere utilizar una frecuencia más alta para esta prueba.

La fuente de alimentación se puede hacer con pilas o fuente común.

El consumo será mayor en el momento en que el relé con los contactos cerrados, ya que, con los contactos abiertos la corriente necesaria es del orden de 0.5 mA.

 

Cl1- 4093

D1- 1N4148

Q1- BC548 o equivalente

K1- relé - Vea texto

 

Capacitores: 16 V

C1- 22 uF- electrolítico

C2- 100 uF electrolítico

S1- interruptor simple

B1- 6 o 12 V - pilas, fuente o batería

P1- 100 M ohms- resistencias lin o log

 

Resistores: 1/8 W

R1- 100 k ohms

R2- 2.2 k ohms

 

 

 

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