Found in 90s Radio Electronics, this shield can control high voltage loads in the power grid. Isolation is guaranteed by the use of an optical coupler.
Found on Popular Electronics in the 1980s, this circuit detects a change in air pressure using a...
This special effect circuit with LEDs using the 4017 was obtained in a 1982 publication. LEDs are...
We found this version of the siren that makes the American police siren sound in a 1980...