The capacitors on this circuit determine the frequency that this circuit can detect. We can adapt it to work as an interesting shield detector for logic signals.
This small medium wave radio was manufactured in the 1960s in Japan. The circuit is powered by 4...
This circuit from a Popular Electronics shows how to take the audio signal from a telephone line...
This circuit is from a 1966 documentation. The transistor is made of germanium of the time and the...