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 that uses only transistors indicates when the voltage in the circuit has the voltage...
This is the circuit of a robot published in the June 1992 issue of Radio Electronics magazine. The sensors...
This circuit was found in a 1980s documentation. It decodes by identifying a certain frequency tone...