This xenon flasher version for the power grid is from an 80's EDN. The circuit uses a folder and a pulse transformer to trigger the lamp. C1 determines the intensity of the pulses.
This heartbeat sensor circuit was found in the July 1992 issue of Radio Electronics magazine. The...
This amplifier circuit with a low power MOSFET was found in Popular Electronics from the 90s. The...
This circuit, which can be built with several CMOS gates, was found in the March 1996 issue of...