This receiver, whose tuning range depends on L1 and L2, was found in the 1992 special edition of Radio Electronics Experimenter. The circuit is relatively simple and has good sensitivity.
Two operational amplifiers are used in this source obtained in an American documentation...
In the figure we have a classic Clapp oscillator configuration for a frequency of a few tens of...
This circuit is from a 1992 publication and is based on CMOS technology. The circuit is powered by a 6 V...