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 old amplifying stage was found in radios and small amplifiers of the time. The circuit is...
This crystal-controlled oscillator can generate signals as high as 200 MHz. The L1 coil is made up...
The circuit shown in the figure is triggered by an input voltage determined by the setting of P1....