Este circuito acciona LEDs bicolores verde / rojo y LEDs comunes amarillos en una secuencia que es igual al de un semáforo. El circuito puede ser usado en maquetas o con fines didácticos. Su montaje es simple, ya que se utilizan componentes comunes.

   El diseño descrito puede ser usado en maquetas o aún, con la utilización de lámparas, con finalidad didáctica para la enseñanza de reglas de tránsito.

   Los LEDs o las lámparas pueden tener la misma disposición de un semáforo común, como se muestra en la figura 1.

 

   Figura 1 - Posibilidades de montaje
   Figura 1 - Posibilidades de montaje

 

 

   En la versión original, el circuito integrado utilizado, que es un 4017, puede alimentar directamente LEDs, pero existe la posibilidad de emplear interfaces de potencia para lámparas de mayor potencia.

 

   Así, en la figura 2 tenemos una interfaz para lámparas incandescentes de 6 a 12 V con corrientes hasta 500 mA.

 

   Figura 2 - Interfaz para lámparas de 6 o 12 V
   Figura 2 - Interfaz para lámparas de 6 o 12 V

 

 

   Podemos utilizar lámparas incandescentes de color hasta unos 400 W con la interfaz mostrada en la figura 3.

 

   Figura 3 - Control de las lámparas conectadas a la red de energía
   Figura 3 - Control de las lámparas conectadas a la red de energía

 

 

   Para este circuito los SCR deben ser sufijos B o D si la red es de 110 V y D si la red es de 220 V.

   Para lámparas superiores a 25 W, el SCR debe estar dotado de un disipador de calor.

   El funcionamiento es sencillo de entender.

   Tenemos un oscilador con el 555 cuya frecuencia y controlada en P1 determinando el ciclo de accionamiento del semáforo.

   Las señales de este oscilador se aplican a un 4017 que tiene sus 10 salidas decodificadas por un conjunto de diodos.

   Los diodos se conectan de tal forma que accionan siempre dos LED cada vez en el ciclo de funcionamiento de un semáforo.

 

   Montaje

   En la figura 4 tenemos el diagrama completo del aparato.

 

   Figura 4 - Diagrama del semáforo
   Figura 4 - Diagrama del semáforo

 

 

   La placa de circuito impreso para el montaje se muestra en la figura 5.

 

 

   Figura 5 - Placa de circuito impreso para el montaje
   Figura 5 - Placa de circuito impreso para el montaje

 

 

   Al realizar el montaje, observe las posiciones de los circuitos integrados y la polaridad de los LEDs y de los capacitores electrolíticos.

 

  Los capacitores son para 16 V o más y los resistores de 1/8 W con cualquier tolerancia.

 

  Los LEDs verde y rojo son del tipo bicolor, pero se pueden utilizar LEDs independientes e incluso tricolores, si el lector tiene facilidad para su obtención.

 

   La alimentación del circuito puede ser efectuada por pilas o por fuente.

 

   Para probar y usar, basta con conectar el circuito y ajustar P1 para la velocidad de funcionamiento deseada.

 

 

CI-1 - 555 - circuito integrado

CI-2 - 4017 - circuito integrado

LED1 a LED4- LEDs según los colores indicados en el diagrama

D1 a D10 - 1N4148 - diodos de uso general

P1 - 1 M ohms - pote

C1 - 1 a 10 uF - capacitores electrolítico

C2 - 100 uF - capacitores electrolítico

R1 - 22 k ohms - resistor - rojo, rojo, naranja

R2 - 10 k ohms - resistor - marrón, negro, naranja

R3, R4 - 1 k ohms - resistores - marrón, negro, rojo

Varios:

Placa de circuito impreso, caja para montaje, fuente de alimentación o pilas, hilos, soldadura, etc.

 

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