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.
In the figure below we have two triggers made with the LM3900 transconductance operational...
The trigger signal for this circuit is an audio tone. Tones up to close to 100 kHz can be used. The...
Found in an American documentation from the 90's, this 1.5 A power supply provides 1.5 to 22 V of...