Las lámparas incandescentes ya no se utilizan en iluminación, por su bajo rendimiento, pero todavía se pueden emplear en aplicaciones especiales, como este circuito de efectos para vitrinas, escenarios, conjuntos musicales y otros. Vea en este artículo cómo construir las psico-lámparas.

Este circuito hace que un conjunto de lámparas incandescentes parpadea rápidamente variando la frecuencia de modo aleatorio con un efecto visual muy interesante.

Con el triac usado se pueden controlar hasta 800 W de lámparas en la red de 110 V y el doble en la red de 220 V.

El circuito utiliza componentes comunes y es fácil de montar.

En la figura 1 tenemos las formas de las señales generadas y el resultado de su combinación.

 

Figura 1 - Señales generadas por el circuito
Figura 1 - Señales generadas por el circuito

 

Estas señales se generan por 4 osciladores ajustables elaborados alrededor de las cuatro puertas NAND de un circuito integrado 4093.

Cuando las señales se combinan en una salida única obtenemos un patrón único de pulsos que se aplica a un triac.

El triac tiene por carga el conjunto de lámparas incandescentes, que pueden ser decentes diferentes conectadas en paralelo.

En la figura 2 tenemos el diagrama del sector de baja potencia del circuito que consiste en los osciladores.

 

Figura 2 - Diagrama del sector de generación de pulsos
Figura 2 - Diagrama del sector de generación de pulsos

 

La placa de circuito impreso para el montaje se muestra en la figura 3.

 

Figura 3 - Placa de circuito impreso para el montaje
Figura 3 - Placa de circuito impreso para el montaje

 

El sector de alimentación y de potencia se muestra en la figura 4, observándose que el triac debe tener sufijo B o D si la red es de 110 V y sufijo D si la red es de 220 V.

 

Figura 4 - sector de potencia y alimentación
Figura 4 - sector de potencia y alimentación

 

El triac debe estar dotado de un disipador de calor y la corriente del transformador puede oscilar entre 300 y 500 mA.

En el montaje, observe la posición de los circuitos integrados y del transistor así como la polaridad del diodo.

Los resistores son de 1/8 W con cualquier tolerancia y los demás componentes de acuerdo con la lista de materiales.

Los capacitores electrolíticos son de 16 V o más.

Para usar, ajuste los trimpotes para el efecto deseado, recordando que el circuito es alimentado por la red de energía, debiendo ser tomadas las precauciones contra golpes.

 

CI-1 - 4093 - circuito integrado

CI-2 -7812 - circuito integrado

Triac - TIC226 B o D - ver texto

Q1 - BC337 - transistores NPN de uso general

D1a D12 - 1N4148 - diodos de uso general

D13, D14 - 1N4002 - diodos rectificadores

R1 a R8 - 10 k ohms - resistores - marrón, negro, naranja

R9 - 12 k ohms - resistor - marrón, rojo, naranja

P1 a P4 - 1 M - potenciómetros

C1 a C4 - 10 uF - capacitores electrolíticos

C5 - 100 uF - capacitor electrolítico

C6 - 1 000 uF - capacitores electrolíticos

T1- transformador con 12 + 12 V - 300 a 500 mA

F1-fusible de acuerdo con la cantidad de lámparas

S1 - Interruptor simple con capacidad de acuerdo con las lámparas

Varios:

Placa de circuito impreso, radiador para el triac, caja para montaje, cable de fuerza, hilos, soldadura, etc.

 

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