Using a capacitor as a sensor, this circuit was found in the 1989 Radio Electronics Experimenter magazine. The circuit must be assembled in a shielded box.
This is a circuit with a period component that consisted of a voltage reference. The circuit is...
The critical components of this 1978 circuit are transformers, which, hopefully, can be obtained from...
We found this circuit in the March 1991 issue of Radio Electronics magazine. The integrated...