Es un interesante circuito valvular de amplificador de potencia para uso automotriz. Puede ser usado en propaganda o aviso u otras aplicaciones móviles.

En esta aplicación la alta tensión es obtenida por un vibrador, que consiste en un sistema electromecánico que era empleado en los radios valvulados de automóvil de los años 40, 50 y 60. Este circuito posee una lámina que vibrando rápidamente generaba una baja tensión pulsante en un transformador, si así la alta tensión para los circuitos valvulados.

En los circuitos modernos ese vibrador sería sustituido por un convertidor DC / DC de alta tensión. La alta tensión se obtiene de un transformador especial y dos válvulas rectificadoras 6X5.

La sensibilidad de entrada para un micrófono es de 4 mV. Para un fonocaptor es de 200 mV. El consumo de este circuito con 6 V es de 8 A y en 12 V de 4 A.

Además de las válvulas, los componentes críticos de este proyecto son los transformadores.

En la figura 1 el diagrama completo del amplificador.

 

Amplificador de 11 W Alimentado por 6 u12 V
Amplificador de 11 W Alimentado por 6 u12 V | Haga click en la imagen para ampliar |

 

 

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