Preamplificador con control de tono (ART1686S)

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

Este artículo describe el montaje de un preamplificador transistorizado que incluye un control de tono tipo Baxandall de excelente calidad. El circuito es alimentado por una tensión de 24 V que puede venir de fuente o aprovechada del propio amplificador con el que funcionará.

  La ganancia de este excelente amplificador es de 20 dB y la impedancia de entrada de 220 k ohms. El refuerzo de graves es de 12 dB y la atenuación de graves de 12 dB, El consumo es de 5 mA.

   Lo que tenemos en esta configuración son dos transistores bipolares y un transistor de efecto de campo de unión, en una configuración de excelente calidad de sonido. Las señales pasan por Q1 que también recibe la retroalimentación del control de tono, siendo entonces llevados al FET. De él, las señales van para el control de tono y para la salida.

 

 

Montaje

   En la figura 1 tenemos el diagrama completo del control de tono.

 

   Figura 1 - Diagrama del control de tono
   Figura 1 - Diagrama del control de tono | Clique na imagem para ampliar |

 

   

En la figura 2 tenemos la placa de circuito impreso para el montaje del preamplificador.

 

   Figura 2 - Placa de circuito impreso para el montaje
   Figura 2 - Placa de circuito impreso para el montaje | Clique na imagem para ampliar |

 

   

En el montaje, observe las posiciones de los transistores y la polaridad de los capacitores electrolíticos. Los electrolíticos son para 25 V o más y los demás capacitores pueden ser cerámicos o de poliéster.

   Los resistores son de 1/8 W. Los cables de entrada y salida de señales están blindados.

   

 

Lista de material

Q1- BC549 - Transistores NPN de bajo ruido

Q2 - BF245 - JFET de uso general

Q3 - BC548 - Transistores NPN de uso general

P1, P2 - 22k ohms - potenciómetros lineales

C1, C4 - 22 uF x 25 V - capacitores electrolíticos

C2 - 1 uF - capacitor electrolítico o poliéster

C3 - 10 pF - capacitor de cerámica

C5, C6 - 10 uF x 25 V - capacitores electrolíticos

C7 - 150 nF - capacitor de cerámica o poliéster

C8 - 1,5 uF x 25 V - capacitor electrolítico

C9 - 33 nF - capacitor de cerámica o poliéster

C10 - 330 nF - capacitor de cerámica o poliéster

C11- 100 uF x 25 V - capacitor electrolítico

R1 - 680 k ohms - resistor - azul, gris, amarillo

R2 - 22 k ohms - resistor - rojo, rojo, naranja

R3, R4 - 220 k ohms - resistores - rojo, rojo, amarillo

R5 - 33 k ohms - resistor - naranja, naranja, naranja

R6 - 5k6 ohms - resistor - verde, azul, rojo

R7 - 3k9 ohms - resistor - naranja, blanco, rojo

R8 - 3k3 ohms - resistor - naranja, naranja, rojo

R9 - 2k2 ohms - resistor - rojo, rojo, rojo

R10 - 220 ohms - resistor - rojo, rojo, marrón

Varios:

Placa de circuito impreso, hilos, soldadura, cables blindados, etc.

   

 

 

Buscador de Datasheets


N° de Componente 

Banco de Circuitos

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