Designers often choose a super-regenerative receiver—despite its frequency instability and poor selectivity—for battery-powered, short-range, wireless applications in which power consumption is a ...

Crystal radios may be the simplest kind to make, but regenerative receivers are more practical and only a little more complicated. A recent design by [Selenium] is super simple because it uses a ...

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 ...

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.

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 ...