Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an inverted phase using a relay and a unit gain stage.
The figure shows the basic circuit of a relaxation oscillator with operational amplifier. The...
This xenon flasher version for the power grid is from an 80's EDN. The circuit uses a folder and a...
Found in an old Radio Electronics, this circuit uses current components, used to rectify AC...