1. NiCd battery charger for flashlight.
2. FET based voltage regulator.
3. Constant current sources.
4. Constant current source.
5. Op-amp as voltage regulator circuit.
6. Constant current source with cascode of n-p-n transistors.
7. Two-terminal constant current source.
8. Constant current sources.
9. Battery charger circuit diagram.
10. DC-DC voltage converter circuit schematic.
11. Very good battery charger circuit.
12. Replacement for high voltage zener diode.