Found in a Popular Electronics from the 90s, this circuit presents the difficulty of obtaining the Geiger Tube. The other components are common, admitting equivalents.
Using the 741 operational amplifier this circuit was found in the August 1993 Electronics Now...
We found this circuit in a 1967 documentation. The circuit can be designed based on current...
Found in Popular Electronics, this configuration can be powered by voltages from 6 to 12 V....