Uno de los circuitos reguladores de tensión más tradicionales, bastante antiguo, pero todavía de uso frecuente incluso en equipos fabricados hoy en día, es el regulador de tensión “723”. Si el lector necesita una buena fuente regulada para el banco, el circuito con el 723 es una buena sugerencia. Este circuito integrado tiene una serie de características que, con algunos componentes externos, permite la elaboración de fuentes de alimentación eficientes en un amplio rango de corrientes y tensiones. En la figura tenemos una fuente de alimentación típica de alta corriente utilizando este circuito integrado como base. Las características de esta fuente de alimentación son:

• Tensión de salida ajustable entre 2 y 15 V

• Corriente de salida máxima 1,2 A

Como podemos ver, el transistor 2N3055, que debe estar equipado con un disipador de calor, controla la corriente principal, siendo la tensión suministrada como referencia por el circuito integrado 723. El secundario del transformador debe suministrar una tensión de 15 + 15 V con 1, 2 A y primario según la red eléctrica. Para el filtrado, el condensador C1 debe tener una tensión de trabajo de al menos 25 V.

 

Circuito tradicional con el LM723
Circuito tradicional con el LM723

 

 

 

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