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.
This circuit, which can be used on an optical link, is suggested by the Texas Instruments...
The operating voltage of this circuit is 18 V, and the source current is 3.5 A. The circuit is...
This circuit is from the time when seat belts were still being adopted. Obtained from a 1976...