This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The transistor must be equipped with a heat sink. The circuit has a battery charger.
We found this circuit in a documentation from the year 2000. This circuit appears on the site...
This two-phase regulator circuit was found in an Electronic Design from the 90's. The components used...
This two-transistor preamplifier was found in a 1960 Sylvania transistor manual. The output...