En nuestra serie Banco de Circuitos publicamos gran cantidad de circuitos prácticos de aparatos de todo tipo. Así, tenemos ediciones sobre fuentes, displays, LEDs, alarmas, circuitos automotores, radios, transmisores y mucho más. Sin embargo, tenemos en nuestro inventario miles de circuitos prácticos, de hecho, más de 7 000 en el momento en que escribimos este artículo, así mismo reuniendo una gran cantidad de ellos en nuestras ediciones sobra mucho, y en nuestra programación, algunos de ellos van a tardar mucho para salir. La solución encontrada es entonces hacer algunas selecciones y colocar en el sitio como esta en que elegimos algunos proyectos interesantes de amplificadores.

 

Amplificador Híbrido 20 o 30 W

Este amplificador utiliza módulos híbridos de Sanken que todavía se pueden encontrar en algunos proveedores, ya que también se utilizan en circuitos de automatización y control. Puede suministrar potencias de 20 o 30 W, según el módulo utilizado y la fuente de alimentación. El circuito requiere una placa bien planificada y una buena área de disipación para el módulo híbrido. La calidad de sonido obtenida es excelente ya que el módulo fue utilizado en diversos productos comerciales de la época (años 70 y 80).

 


 

 

 

Amplificador Transistorizado de 30 W

Este circuito se obtuvo en una vieja publicación de 1974 pero todavía se puede montar con algunos cambios de componentes. TR2 puede ser un BD135, TR1 un BC548 y TR3 un BD136.La fuente debe proporcionar una corriente de al menos 2 A y los transistores de salida deben estar dotados de radiadores de calor. Observe que la fuente es simétrica.

 


 

 

 

Amplificador de 1,5 W con el LM388

El circuito tradicional fue retirado de una revista francesa Radio Plans que ya no existe, pero puede ser todavía montado pues el CI todavía puede ser encontrado, aunque con alguna dificultad. La potencia depende de la tensión de alimentación y de la carga.

 


 

 

 

Amplificador de alta potencia con MOSFET

Este circuito se obtuvo en una revista inglesa de 1990. El circuito se puede montar con MOSFETs de potencia equivalentes. Los transistores del par diferencial de entrada PNP pueden ser los BC557 y el par NPN los BC547. Para la excitación de los MOSFETs se puede utilizar el BD136 (PNP). La fuente debe ser simétrica y la potencia es de algunas decenas de vatios. La corriente de la fuente debe ser de al menos 2 A.

 


 

 

 

Amplificador AD161-AD162

El circuito que presentamos fue encontrado en una revista inglesa de 1973. El par complementario de transistores de potencia AD161 y AD162 era muy popular en la época posibilitando la construcción de buenos amplificadores hasta unos 5 o 6 W. Si el lector encuentra en la chatarra estos transistores puede usarse en el circuito presentado, cambiando TR1 por un BC548 y TR2 por un 2N2222 o BD135. La fuente es de 12 V a 15 V con al menos 1 A.

 


 

 

 

Amplificador de 7 W TBA810S

Este circuito fue encontrado en la revista italiana Radio Elettronica de septiembre de 1977. Se trata de un buen amplificado0r de audio de 7 W con el circuito integrado TBA810S que tiene aletas para ser soldadas en áreas cubiertas de la placa que funcionarán como di9ssipers. La fuente debe ser de 16 V con al menos 1 A.

 


 

 

 

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