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 simple circuit is powered by the logic circuit itself. Components are still common, although...
This configuration using the four transconductance operational amplifiers of an LM3900 was found...
This circuit uses two light-activated SCRs or LASCRs, uncommon components today. The power depends on...