1-Ttube reflex receiver (T1555E)

This one-tube circuit is equivalent to the previous one. We find it in a 1924 book by Gernsback, Power is made by batteries.

Magic Lamp (CB12351E)
This circuit was found in a French publication called Generation Electronique, It can be assembled...
VHF / UHF Oscillator (CB15470E)
The configuration shown in the figure is one of the most traditional when it is desired to produce...
Grounding test (CB10092E)
This simple circuit for a common 110 V power grid was found in a 1980s American documentation. The circuit uses...