The crystal radio is a time-honored build that sadly doesn’t get much traction anymore. Once a rite of passage for electronics hobbyists, the classic coil-on-an-oatmeal-carton and cat’s whisker design ...

[h. p. friedrichs] (AC7ZL) has some great plans for building a crystal radio. The stator coil and output coil are wrapped around the outside of a CDR sleeve. The tuning capacitor is constructed by ...

Crystal radio receiver with vertical coil, written on bottom: "right ground / left ariel" [sic], and "lower down / ground [wire?] / higher up at / left is / ariel" [sic]. arrow-up Back to top ...