This circuit was published in Radio Electronics magazine in June 1959. The circuit uses an inverter with transformer to generate the high voltage of the Geiger tube.
This circuit is from an old documentation. However, it can be mounted with modern equivalent...
Using the 723 integrated circuit, this circuit was found in an article on power supplies in the...
A low voltage heating element (up to 30 V) with a current of up to 3 A can be precisely controlled with...