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 preamplifier for magnetic cartridges was found in the February 1990 issue of Radio...
This oscillator for receiving SSB signals is intended for receivers with IF of 455 kHz. The...
This simple transmitter for the citizen range was obtained in a 1983 publication and has only one...