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!
Showing posts with label Cheap Shortwave Transmitter. Show all posts
Showing posts with label Cheap Shortwave Transmitter. Show all posts
20091108
Cheap Shortwave Transmitter
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!
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