Este circuito sintonizado con precisión se encontró en la documentación estadounidense de la década de 1960. Los transistores son de germanio y las bobinas son de grado comercial de la época.

Indicador nulo sintonizado
Este circuito sintonizado con precisión se encontró en la documentación estadounidense de la década de 1960. Los transistores son de germanio y las bobinas son de grado comercial de la época.
Este amplificador utiliza un circuito integrado de 1975, poco común actualmente. El circuito tiene una...
Incluso sin utilizar componentes activos, sólo un relé, esta alarma sugerida por el 101...
En la figura tenemos una configuración para integrado CMOS, en este caso el 4001, con la...
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