This circuit was found in an American documentation from 1969. The circuit is a multi-indicator with resistors typically 47 k for R1 and 100 k for the others.
Published in the December 1988 issue of Radio Electronics magazine, this circuit converts your...
For experiments with ionization chambers and Geiger valves this circuit generates high voltage from...
Suggested by Linear Technology, this 80's circuit makes use of an operational of the time but can...