Este preamplificador utiliza un transistor Darlington de alta ganancia para excitar la entrada de amplificadores incluso con señales de poca intensidad de micrófonos, cápsulas fonográficas u otras fuentes. Alimentado con 6 o 9 V, es fácilmente intercalado entre la fuente de señal y el amplificador.

La base de este proyecto es un "Super transistor" Darlington, el BCS17 que tiene una ganancia mínima de 30 000 veces.

En este circuito el transistor opera en la configuración de emisor común con una buena ganancia de tensión e impedancia media de entrada, lo que facilita su utilización con una amplia gama de fuentes de señales.

El consumo de la unidad es muy bajo, lo que permite su alimentación a partir de pilas o baterías. Cambios en algunos resistores de polarización pueden modificar la ganancia y así adecuar el aparato a diversos tipos de fuentes de señales.

 

CARACTERÍSTICAS

Tensión de alimentación: 6 o 9 V

Corriente de consumo: 1 mA (tip)

Ganancia mínima del transistor: 30 000

 

COMO FUNCIONA

Un transistor Darlington de baja potencia, con una ganancia mínima de 30 000 veces, se conecta a la configuración de emisor común.

La base de este transistor es polarizada por R1 y R2, y la señal extraída de R3, que sirve como carga de colector.

La señal se aplica a la base del transistor vía C1. El capacitor C2 sirve como desacoplamiento de emisor, y R4, hace la polarización del emisor, C4 desacopla la fuente de alimentación del circuito.

La relación entre R1 y R2 determina el punto de funcionamiento del transistor, que debe permanecer en la región lineal de su característica.

En función de las tolerancias de los componentes, eventualmente R2 debe cambiarse en el rango de 150 k ohmios a 470 k ohmios para garantizar una mejor ganancia sin distorsión.

En la figura 1 tenemos el diagrama completo del preamplificador.

 

Figura 1 - Diagrama del preamplificador
Figura 1 - Diagrama del preamplificador

 

 

MONTAJE

La disposición de los componentes en una placa de circuito impreso se muestra en la figura 2.

 

Figura 2 - Placa para el montaje
Figura 2 - Placa para el montaje

 

Con el circuito presenta una ganancia muy alta y opera con señales de poca intensidad es necesario tener cuidado con las conexiones de entrada y salida de señales, que deben ser hechas con cables blindados debidamente conectados a tierra.

 

PRUEBA Y USO

Conecte la salida del preamplificador a la entrada de un amplificador cualquiera.

En la entrada del preamplificador conecte una fuente de señal de poca intensidad, como un micrófono.

Ajuste el volumen del amplificador para obtener la mejor reproducción. Para una versión estéreo monte dos circuitos iguales pero con sólo una fuente de alimentación en común.

Si observa roncos o inestabilidades, compruebe el blindaje de los cables de señal.

Si observa distorsiones con señales débiles, cambie el valor de R2.

 

Semiconductor:

Q1 - BC517 - transistores Darlington

 

Resistores (1/8 W, 5%):

R1 - 4,7 M ohms

R2 - 330 k ohms

R3 - 10 k ohms

R4 - 1 k ohms

 

Capacitores:

C1 - 220 nF - poliéster o cerámico

C2 - 47 uF - electrolítico de 12 V

C3 - 470 nF - poliéster o cerámico

C4 - 100 uF - electrolítico de 12 V

 

Varios:

J1, J2 - Jaques RCA

S1 - Interruptor simple

B1 - 6 o 9 V - pilas o pilas

Placa de circuito impreso, caja para montaje, tíos blindados, hilos comunes, soldadura, etc.

 

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