El temporizador que presentamos tiene su ajuste en un potenciómetro de 1 M ohms. Cuando cerramos S1 activando la alimentación, el capacitor C1 empieza a cargar vía potenciómetro y R1 hasta alcanzar la tensión de disparo del SCR.

   Cuando esto ocurre, el SCR se enciende, encendiendo la lámpara y así permanece indefinidamente (mientras haya alimentación).

   Para desactivar el SCR, basta con presionar momentáneamente el interruptor S2.

   En el potenciómetro se puede adaptar una escala de tiempos que se obtendrá con la ayuda de un reloj o cronómetro común.

  En lugar de la lámpara y posible utilizar un relé sensible de 6 V que entonces puede emplearse para controlar cargas externas de mayor potencia.

   En este caso la alimentación debe ser hecha con 9 V para compensar una caída de 2 V en el SCR.

   El intervalo obtenido varía de unos segundos hasta algunos minutos, dependiendo del valor y la calidad del capacitor usado.

 

MONTAJE

   En la figura 1 tenemos el diagrama completo del temporizador.

 

Figura 1
Figura 1

 

  El montaje, basándose en un pequeño puente de terminales, se muestra en la figura 2.

 

Figura 2
Figura 2 | Clique na imagem para ampliar |

 

   

El SCR puede ser el TIC106, MCR106 o cualquier otro con tensión a partir de 50 V.

   La alimentación debe ser suministrada por 4 pilas pequeñas o medianas y la lámpara debe ser de baja corriente (6 V x 50 mA).

   Los resistores son de 1/8 W o mayores y el capacitor electrolítico debe tener una tensión de trabajo de al menos 6 V.

   El conjunto se puede instalar en una pequeña caja. de plástico y entre sus utilidades sugerimos la de temporizador para partidas de ajedrez o bien en el control de la cocción de alimentos o baños químicos.

 

SCR - TIC106 o equivalente diodo controlado de silicio

L1 - 6 V x 50 mA - lámpara común

P1 - 1 M - potenciómetro

S1 - Interruptor simple

S2 - Interruptor de presión

B1 - 4 pilas pequeñas

R1, R2 - 10 k x 1/8 W - resistores - marrón, negro, naranja

C1 - 470 pF a 1 000 uF x 6 V - capacitor electrolítico

 

Varios:

   Soporte de pilas, puente de terminales, caja para montaje, botón para el potenciómetro, hilos, soldadura, etc.

 

 

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