Although the ubiquitous LM386 IC was designed to be used as an audio amplifier, it has a number of undocumented characteristics that can be exploited to create simple radio receiver circuits that ...

Editor’s note: PhD candidate, Seyyed Hossein Pishgar approached me with this paper, which I believe has some unique and creative circuitry and architectures. I have ...

For over a century now, radio amateurs have made tuned circuits using a coil of wire and a variable capacitor. In recent decades the supply of variable capacitors has dwindled, as SDR technology has ...