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.
This circuit was found in the September 1983 issue of Radio Electronics magazine. The relay is...
This circuit is from an old documentation but can be implemented with a BD136 for Q1 and 2N3055 for...
This power supply that we found in an old American documentation uses an integrated circuit that...