Mezclador Activo de Tres entradas (ART971S)

Written by: Newton C. Braga
Category: Artículos Técnicos y Proyectos

Describimos el montaje de un mezclador transistorizado con 3 entradas. Este mezclador puede servir como una pequeña mesa de sonido para la edición de programas, estaciones experimentales o conjuntos musicales.

   El mezclador que describimos utiliza tres transistores para garantizar una buena amplificación para las señales.

   Para una versión estéreo, podemos montar dos unidades iguales, siendo una para cada canal.

   La alimentación es hecha por una batería de 9 V y, como el consumo es muy bajo, su durabilidad será muy grande.

 

   Montaje

   En la figura 1 tenemos el diagrama completo del mezclador.

 

   Figura 1 - Diagrama completo del mezclador
   Figura 1 - Diagrama completo del mezclador | Haga click en la imagen para ampliar |

 

  El montaje se realizará en una placa de circuito impreso como el estándar mostrado en la figura 2.

 

   Figura 2 - Placa de circuito impreso para el montaje
   Figura 2 - Placa de circuito impreso para el montaje | Haga click en la imagen para ampliar |

 

   Como se trata de montaje de audio, sensible a la captura de roncos, todos los cables de señal deben ser blindados y la caja de metal.

   Para las entradas y la salida se deben utilizar los jack de acuerdo con las fuentes de señal y el amplificador.

   Los resistores son todos y 1/8 W y los capacitores electrolíticos para 12 V o más.

   Para usar, el mezclador se intercalará entre la fuente de señal y la entrada del amplificador u otro equipo de sonido.

   Las entradas son de alta impedancia así como la salida que proporciona una señal de algunos cientos de milivoltios.

  Para fuentes de alta impedancia R1, R2, R3 tendrán valores entre 10k y 50k y para fuentes de baja entre 1k y 4k7.

    Deben realizarse experimentos.

   

Q1, Q2, Q3 - BC548 - transistores NPN de uso general

R1, R2, R3 - resistores - ver texto

R4, R5, R6 - 220 k ohms - resistores - rojo, rojo, amarillo

R7, R8, R9 - 47 k ohms - resistores - amarillo, violeta, naranja

R10 - 470 ohms - resistor - amarillo, violeta, marrón

R11 - 1k2 ohms - resistor - marrón, rojo, rojo

P1, P2, P3 - 10 k ohms - potenciómetros

C1, C2, C3 - 10 uF - electrolíticos

C4 - 220 uF - electrolítico

C5 - 100 uF - electrolítico

C6 - 22 uF - electrolítico

E1, E2, E3 - jack

S1 - Interruptor simple

B1 - 9 V - batería

 

Varios:

Placa de circuito impreso, conector de batería, cables blindados, caja para montaje, etc.

 

pcbway_012_2024

Buscador de Datasheets


N° de Componente 

Banco de Circuitos

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