Found in Popular Electronics from the 90s, this circuit detects modulated infrared radiation and serves as a test for remote controls. Infrared sensors equivalent to the one indicated can be used.
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...