Found in the 1974 Ferranti transistor manual, this Schmitt trigger circuit uses general-purpose transistors of the time.
Found on Popular Electronics this circuit has variations found throughout this site and section....
This charger sources currents in three ranges: 10 mA, 25 mA and 50 mA; Current is sellected...
This circuit, obtained from ancient English documentation, produces a pulse every 24 hours when a 50...