Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
We found this circuit in the Linear Applications Handbook by National Semiconductor. The circuit is...
This wide-range radiation monitor was found in a 1980s documentation. The circuit uses a diode as a...
This circuit is from an article that appeared in the June 1974 issue of Radio Electronics...