This lead-acid battery charger was found in a Popular Electronics from the 90s. The circuit has a maximum current of 2 A, being suitable for powering inverters in emergency lighting systems.
This circuit with low impedance output and 900k input impedance was found in the October 1993...
This oscillator for Morse code training was found in a Popular Electronics from the 90s. The...
This is another one of the many debouncer circuits that the reader can find on this site, and it...