At a recent Ham Radio rally, I came across a couple of working Geiger counters, for less than the price of one of my G-M tubes, but it was still quite fun and instructive to make
The apparent ineffectiveness of C5a was due to a bad switch. with this fixed, the value shown gives an equilibration time of ~2 min., useful for low count rates, e.g. background. - AFW
Simple Geiger Counter
Simple Geiger Counter
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