Crystal radios used to be the “gateway drug” into hobby electronics. Trouble was, there’s only so much one can hope to accomplish with a wire-wrapped oatmeal carton, a safety-pin, and a razor blade.

The circuit has been designed to function as amplifier-detector to produce high quality of audio output through the external earphone. The circuit has been designed to function as amplifier-detector ...

Sixty-one years ago, on January 31, 1954, Edwin Armstrong, who invented the regenerative, super regenerative, and superheterodyne detector circuits for continuous-wave and amplitude modulation and the ...

In our surface-mount age, it’s easy to be jaded about miniaturization. We pretty much expect every circuit to be dimensionally optimized, something that’s easy to do when SMDs that rival grains of ...