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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Differential Amplifier (CB6546E)
This circuit was found in an American publication from 1968. The transistors are from the time,...
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This preamp with several inputs using germanium transistors from the time was found in Japanese...
Crossing Signal for Railroad Modeling (CB3854E)
This circuit uses two sensors that are placed at the intersection of a miniature railway, causing...