En su Application Note AN1282 la STMicroelectronics (www.st-micro.com) muestra cómo montar un preamplificador y un controlador para altavoces usando el circuito integrado TS295. (2007)

El circuito puede funcionar con tensiones de alimentación muy bajas (2,7 V) y excita cargas de baja impedancia como fuentes de 32 ohms.

En la figura 1 tenemos la utilización de los sectores A1 y A4 como preamplificadores, y los otros dos como amplificadores de potencia excitando un auricular como monitor.

 


 

 

Una tierra/fantasma se utiliza como nivel común de referencia (Vcc / 2). La fuente de alimentación se obtiene de dos baterías LR6 que suministran 1,5 V cada una. En el preamplificador A1 y A4 se conectan para formar amplificadores no inversores con las ganancias determinadas por:

A1 - G = (R4 / (R3 + R17))

A4 - G = R6 / R5

Con los valores de los componentes utilizados en el diagrama, la ganancia del circuito preamplificador será de 58 dB.

 

Sin embargo, se puede tener una ganancia ajustable para el circuito si la resistencia R17 es sustituida por un transistor JFET. El JFET funcionará como un resistor controlado por tensión, obteniéndose así un control automático de ganancia, lo que puede ser interesante según la aplicación.

Con el FET el pico de la señal de salida es rectificado para generar la señal de control del preamplificador. En la figura 2 tenemos la curva de respuesta del circuito.

 


 

 

 

Los amplificadores A2 y A3 se utilizan para formar un paso amplificador de potencia en push-pull para excitar un auricular. La ganancia de este circuito es 5.

Las entradas estéreo se pueden conectar a un CD-player, por ejemplo, y el circuito excitar directamente un auricular de 32 ohmios con una excelente calidad de sonido.

En la figura 3 tenemos la curva de distorsión del circuito en función de la frecuencia.

 


 

 

  

Otras aplicaciones incluyen su uso en reproductor de MP3 o como paso de audio para excitación de cajas amplificadas o en amplificadores de alta fidelidad.

 

 

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