The primary components you need to build this simple tool are: a Collector modulated AM oscillator with an amplifier and b Crystal oscillator integrated circuit. The circuit can be connected with an amplified dynamic microphone or to an electret microphone. Also there is possibility to enable connection directly with a dynamic microphone to the LF pre-amp stage of a transistor. This way you can build a small system that would receive signal from an AM wave receiver. Though the circuits used in radio stations are more complex, this simple design will at least give a clear concept behind the understanding of designing such system.
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1 Watt AM/CW Transmitter Circuit
BSX20 . Datasheet. Equivalente. Reemplazo. Hoja de especificaciones. Principales características
BSX20 Datasheet, Equivalent, Cross Reference Search