This is a really cheap and probably illegal shortwave transmitter, don't build it. It just feeds the output from an LM386 audio amplifier directly into the power pin of a crystal oscillator can to produce AM-modulated shortwave radio frequencies. This works better than one might expect -- this particular oscillator seems to provide a stable waveform with voltages anywhere from 2.0v to 5.0v!
[link]
Tag :
Analog,
Transmitter
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