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.
Using junction FETs, a configurable configuration is achieved for very low frequencies. FETs can...
Found in an Elektor from the 90s, this circuit converts signals from the 280 kHz band to 516 kHz,...
We found this circuit in a 1976 publication. The transistors can be BC547 or 2N2222. Crystals up...