This circuit, found in a 1964 US documentation, consists of a selective amplifier that lets only 10 Hz pass around a 400 Hz center frequency with the indicated components.
This circuit was found in a 90's Electronic Design. It takes advantage of the nonlinearity...
This sensitive Japanese mid-wave receiver from the 1960s has an output power of 45 mW and is...
This sensitive MW receiver was found in a publication of year 1958., The circuit uses germanium...