Darlington Oscillator (CB21142E)

Indicated by Popular Electronics, in an edition of the 90's, this circuit seems doubtful because of the inductance used, which must be large.

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Touch or leak alarm (CB22092E)
This circuit was found in old documentation. The SCR can be any of the 106 family. Note the sensor...
Staircase generator (CB21847E)
This circuit was found in Ferranti's 1974 transistor manual. The transistors are from the period and...
Transistor relaxation oscillator (CB12680E)
Short duration pulses can be obtained with the relaxation oscillator that uses common transistors and is...