Si usted es coleccionista de coches antiguos o recupera vehículos muy antiguos, puede haber encontrado una radio de la época, todavía usando válvulas y que tiene un componente extraño en nuestros días: el vibrador. Vea lo que hacía este componente y cómo recuperarlo.

En los vehículos anteriores a la era del transistor, los radios todavía eran valvulados, lo que significaba tensiones de cientos de volts para funcionar, diferentes de los 6 o 12 V suministrados por las baterías de los autos de la época.

Como obtener esa alta tensión era un problema resuelto con un componente bastante interesante, totalmente electromecánico, ya que en aquella época no era posible contar con los componentes de estado sólido.

Este componente era el vibrador. Un sistema electromecánico que hacía vibrar rápidamente un conjunto de contactos que, abriendo y cerrando el circuito de un transformador generaban alta tensión.

En la figura 1 tenemos un circuito de un vibrador tipo interruptor obtenido en una edición del Radiotron Handbook edición de 1953, usado en coches de la época.

 

Figura 1- Vibrador tipo interruptor.
Figura 1- Vibrador tipo interruptor.

 

En este circuito la acción de la bobina interna hace que los contactos vibren induciendo en un transformador externo alta tensión.

No es necesario decir que se trata de un dispositivo ruidoso capaz de generar muchas interferencias en sistemas eléctricos cercanos.

La recuperación de un vibrador se puede hacer abriendo su envoltorio metálico y limpiando sus contactos. En la figura 2 tenemos algunos vibradores que aún pueden ser obtenidos en casas especializadas en piezas para coches antiguos según anuncios en internet.

 

Figura 2 - Vibradores comerciales que se pueden comprar aún hoy en tiendas de piezas para coleccionistas
Figura 2 - Vibradores comerciales que se pueden comprar aún hoy en tiendas de piezas para coleccionistas

 

En el circuito completo de fuente de alimentación con vibrador, tenemos los componentes usados en la supresión de los ruidos, en el caso capacitores de mica e inductores. Actualmente, en la recuperación se pueden utilizar capacitores cerámicos.

 

Figura 3 - Fuente completa con el vibrador de una edición de 1953 del Radiotron Handbook.
Figura 3 - Fuente completa con el vibrador de una edición de 1953 del Radiotron Handbook.

 

Es claro que los lectores con habilidades que deseen sustituir el vibrador por un circuito electrónico inversor moderno, existe esta posibilidad mostrada en la figura 4.

 

Figura 4 - Inversor electrónico que sustituye a los vibradores
Figura 4 - Inversor electrónico que sustituye a los vibradores

 

En este circuito los transistores deben estar dotados de disipadores de calor. Para alimentación de 12 V utilice los 2N3055. El transformador tiene devanado de 6 + 6 V o 12 + 12 V con 800 mA a 1 A de corriente y devanado primario de alta tensión de 11- V o 220 V. Las resistencias de 100 ohmios eventualmente deben ser alteradas para obtener buen rendimiento .

 

Figura 5 - Radios de coche existen desde 1922. En la foto dos curiosos modelos antiguos obtenidos en Internet usando válvulas y vibradores ...
Figura 5 - Radios de coche existen desde 1922. En la foto dos curiosos modelos antiguos obtenidos en Internet usando válvulas y vibradores ...

 

 

 

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