Esta fuente de alimentación variable con buena regulación es ideal para la bancada del técnico o estudiante, pudiendo alimentar proyectos diversos y equipos en prueba. El circuito es sencillo de montar usando componentes comunes de fácil obtención.

   Describimos una fuente de alimentación simple que utiliza componentes comunes, pudiendo suministrar corrientes hasta 1 A o menos, según el transformador usado.

   La fuente tiene un circuito integrado regulador que controla dos transistores, siendo uno de potencia, que debe ser montado en radiador de calor.

   La tensión máxima de salida es determinada por el zener, debiendo quedar en torno al valor del secundario del transformador usado que puede ser de 15 V, en la versión original, o 12 v si queremos una tensión máxima un poco menor.

   Los demás componentes de esta fuente son comunes no ofreciendo ninguna dificultad de obtención.

 

   Montaje

   En la figura 1 tenemos el diagrama completo de la fuente de alimentación.

 

Figura 1 - Diagrama de la fuente
Figura 1 - Diagrama de la fuente

 

 El montaje se puede realizar sobre la base de una pequeña placa de circuito impreso como se muestra en la figura 2.

 

   Figura 2 - Montaje en placa de circuito impreso
   Figura 2 - Montaje en placa de circuito impreso

 

  El transistor de potencia debe estar dotado de un pequeño radiador de calor y para la salida se pueden utilizar bornes o hilos con garras.

   Los diodos son los 1N4002 o equivalente y el transformador tiene devanado primario de acuerdo con la red de energía.

   El indicador LED es opcional.

   Para indicar la tensión de salida se puede utilizar un voltímetro común o incluso un multímetro de bajo costo en la escala apropiada de tensiones DC.

   Para utilizar la fuente conecta en la salida el aparato o circuito a ser alimentado, pero siempre ajuste la tensión antes.

   Respete los límites de corriente para que la fuente no se sobrecargue con la quema de sus componentes.

   Si la tensión cae mucho al alimentar un aparato, y no es posible compensar esto con ajustes de P1, es señal que el consumo del aparato alimentado está más allá de la capacidad de la fuente.

   

   CI-1 - circuito integrado LF351

  D1 y D2 - 1N4002 - diodos

  Z1 - Zener de 16 V

  Q1 - BC548 - transistores NPN de uso general

  Q2 - TIP 31 - transistores de potencia

  R1 y R2 - 1,2 k ohms x 1/8 W - resistor - marro, rojo, rojo

   P1 - Potenciómetro de 47 k (lin)

   C1 - 2 200 uF x 25 V-capacitor electrolítico

   C2 - 100 uF x 25 V - capacitor electrolítico

   LE - LED rojo común

   V1 - Voltímetro (ver texto)

   T1 - Transformador con secundario de 15 + 15 V x 1

   S1 y S2 - Interruptores simples

   F1 - Fusible de 1 A

  Varios: placa de circuito impreso, caja para montaje, cable de alimentación, hilos, soldadura, etc.

 

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