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 also be used with flashing LEDs as long as they have in parallel a charge...
This is a bridge for the measurement of low value resistances and high values too. The circuit...
We found this circuit in the November 1992 issue of Radio Electronics magazine. The circuit has...