Encontramos este circuito en una Popular Electronics de mayo de 1990. Con dos transistores y un auricular de alta impedancia es posible recibir las estaciones locales de ondas medias. Q1 y Q2 pueden ser los BC548. L2 consta de 40 + 40 espiras de hilo 28 en un tubo de plástico o cartón de 2 a 2,5 cm de diámetro y L1 20 espiras del mismo hilo en el mismo tubo, al lado de L2. La variable C1 puede obtenerse en una radio transistorizada fuera de uso.

 

 


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