El primer circuito que presentamos es ideal para casar la baja impedancia de transductores, tales como micrófonos o incluso captadores telefónicos con la alta impedancia de entrada de un amplificador o incluso de una mesa de sonido común. En la figura tenemos el circuito completo de este preamplificador, que puede ser alimentado con una batería de 9 V o a partir de 4 pilas pequeñas. Como el consumo de corriente es muy bajo, una batería tendrá enorme durabilidad al alimentar este circuito. Lo que tenemos es un paso amplificador en la configuración de base común. Como se sabe, esta configuración tiene una impedancia de entrada muy baja y una impedancia de salida alta. La ganancia de corriente es baja, pero la ganancia de tensión es alta. Usamos un transistor de alta ganancia y bajo nivel de ruido para proporcionar mejores resultados. El lector podrá utilizar este circuito adaptador con fuentes de señal de impedancia de hasta 600 ohms. La resistencia R3 puede tener valores entre 22 ohms y 470 ohms según la impedancia de la fuente de señal.

 


 

 

 

 

18.837MBMemory Usage46.66msRequest Duration
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