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 consists of a voltage regulator for 6 V batteries with a very low voltage drop. The...
This circuit was obtained from a 1986 Spanish magazine Resistor. The magazine no longer exists, but...
We found this circuit of a transistor siren in a recent English publication. All components are still...