He encontrado este receptor de ondas medias en una antigua publicación de 1951. Se trata de un receptor para la banda de ondas medias pero que, con el cambio de la bobina, puede también sintonizar ondas cortas, del tipo regenerativo. Como todo el receptor de este tipo tenemos gran sensibilidad pero poca selectividad, o sea, el receptor tiende a no separar las estaciones de frecuencias cercanas. Se trata por lo tanto de un proyecto experimental-didáctico, bastante interesante. Tenga cuidado de que no está aislado de la red de energía. El auricular puede ser del tipo de cristal o una cápsula piezoeléctrica del tipo utilizado en el teléfono. La regeneración que lleva al punto ideal de funcionamiento se ajusta en R2. La bobina está formada por 140 espiras de hilo 28 AWG en un tubo de plástico, PVC o cartón de 1 pulgada de diámetro con toma en la 18ª espira desde el lado de tierra. La antena puede tener de 3 metros a 40 metros de longitud. Para las ondas cortas, reduzca proporcionalmente las espiras de la bobina. Observamos que la válvula 1-V puede ser sustituida por un diodo 1N4004.

 


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18.9MBMemory Usage44.2msRequest Duration
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PHP Version8.3.16
Identityguest
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Templatecassiopeia
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