Using the 2N2646 this circuit was found in a Radio Electronics magazine from July 1968. The transistors are from the time and the lamp can be replaced by a high-power LED in a current version.
This is a very simple atomic radiation detector circuit using a Geiger-Muller tube. The circuit was...
This power source, obtained in a 1973 publication, suggests the use of partially burned germanium...
Using a V/F converter this circuit was found in the June 1991 issue of Radio Electronics magazine. The...