Dos artículos anteriores describen osciladores fonográficos valvulados que no son más que circuitos que transmiten la señal de una cápsula de tocadiscos a una radio de ondas medias colocadas cerca.

El circuito puede también ser utilizado como un transmisor AM experimental conectando en su entrada un micrófono cerámico de alta impedancia. La antena es un pedazo de cable de 2 a 5 metros de longitud. En la versión que encontramos en una publicación de 1960 la alimentación es hecha por baterías.

En aquella época eran comunes las baterías de 30 V e incluso más para alimentar circuitos valvulados portátiles. Se puede montar el circuito con una fuente de alimentación, como las descritas en el artículo V009. La bobina está formada por 30 + 30 espiras de hilo esmaltado 28 en una forma de 1,5 cm de diámetro (cartón o PVC). Observe que el filamento de 1,5 V de la válvula es alimentado por una pila grande!

 

Oscilador Fonográfico 3
Oscilador Fonográfico 3

 

 

 

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