This super regenerative detector circuit was found in an English documentation from 1963. The coil is frequency compliant. The transistors are germanium of the time.
This circuit appears in other articles in this section and even in other sections of the site....
This circuit should be placed between the signal source and the input of a recorder or amplifier....
This circuit was found in a 1994 publication. It draws 1 of 41 LEDs when we press and then release...