This circuit is from a Radio Electronics from March 1970. The crystal depends on the frequency at which the signal is to be captured and the resonant circuit determines the tuned band.
This circuit from a June 1957 Radio Electgronics is for oscilloscopes of the time with a maximum...
This simple receiver for listening on a crystal phone tunes the range of medium waves. The circuit...
This circuit in a receiver that allows the capture of distant stations with short waves. The...