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.
Found in Unitrode documentation from the 1980s, this circuit makes use of PUTs, currently common...
This simple circuit with SCR and unijunction transistor appeared in Radio Electronics magazine in July...
This TTL generator that can function as a control shield or external clock for microcontrollers was found in...