This wide-range radiation monitor was found in a 1980s documentation. The circuit uses a diode as a sensor and is quite critical requiring shielding shown in dashes to prevent snoring due to gain.
This circuit generates two signals in phase opposition. The frequency is determined by R1 and C1...
This is the circuit equivalent to the small key chains that were common in the 90s that emitted a...
This “one channel” demonstration circuit was found in the April 1979 issue of Radio Electronics magazine....