Este circuito tiene una acción muy interesante y que puede ser útil en muchas aplicaciones prácticas. Cuando presionamos un interruptor, sólo su salida es accionada, desactivando cualquier otra que esté previamente activada. El circuito puede accionar pasos de potencia con relé y así controlar cargas mayores.

   Con base en un circuito integrado CMOS, se pueden controlar 10 salidas diferentes con monitoreo en LEDs. Las llaves de control pueden ser interruptores de presión o una llave de tecla. Las llaves de este tipo se pueden encontrar en televisores antiguos.

 

   Cuando en funcionamiento, el 4017 recibe las señales de reloj generadas por un 555 en la configuración astable. El circuito, sin embargo, permanece inhibido debido a la presencia del nivel alto en su entrada Clock Enable (pino 13 en el diagrama de la figura 1).

 

   Presionando cualquiera de las teclas de control, la entrada de reloj se lleva al nivel bajo, hasta que la salida correspondiente llegue al nivel alto, cuando entonces el conteo es nuevamente inhibido con esta salida permaneciendo accionada.

 

   Sólo tienes que presionar otra tecla para que la salida correspondiente vaya al nivel bajo y el recuento continúe hasta que se alcanza y nuevamente tendremos la inhibición.

 

   En la figura 1 tenemos el circuito completo de la llave.

 

 

Diagrama de la llave digital con el 4017
Diagrama de la llave digital con el 4017

 

 

El montaje de la versión básica, sin los pasos de potencia puede montarse en una placa de circuito impreso, como se muestra en la figura 2.

 

 

Placa lado 1
Placa lado 1

 

 

Placa lado 2
Placa lado 2

 

 

Los relés pueden ser accionados directamente por los transistores que activan los LED, con pequeñas modificaciones en la placa de circuito impreso.

 

Los diodos pueden ser los 1N4148 y los LED rojos comunes o de otro color, según el propósito del proyecto.

 

 

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