Este ultra simple sintonizador de FM puede captar, con buena calidad de sonido, las estaciones locales y fue encontrado en una publicación de 1982. Montado con material de chatarra, no ofrecerá dificultades para el lector acostumbrado a trabajar con circuitos de alta frecuencia. El circuito se muestra en la figura. Las conexiones entre los componentes deben ser directas y cortas, dando preferencia a la versión que hace uso de placa de circuito impreso. L1 está formada por 2 vueltas de alambre esmaltado 18 a 22, alineada con L2, que consta de 4,5 espiras del mismo hilo. El diámetro de las bobinas es de aproximadamente 1 cm. El choque de RF (XRF) está formado por aproximadamente 50 vueltas de alambre esmaltado fino (32) en un resistor de 100 k. El capacitor variable, para sintonía, es del tipo usado en FM, miniatura, mientras que el trimmer, común, sirve para ajustar el punto de funcionamiento del receptor. Su tensión de alimentación es de sólo 3 V y el aparato debe conectarse a la entrada de un buen amplificador, con la ayuda de un cable blindado. El transistor originalmente utilizado fue el 2SA234. El autor afirma que el BF494 debe funcionar satisfactoriamente, pero con pequeños cambios de valores de algunos componentes.

 


 

 

 

18.837MBMemory Usage42.5msRequest Duration
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PHP Version8.3.20
Identityguest
Response200
Templatecassiopeia
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Conn Collation
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