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.

13. Simple Geiger counter circuit diagram.

14. Battery charger circuit.

15. DC-DC converter based on CD4000.

16. Constant current source.

17. Replacement for zener diod.

18. Voltage regulator with current limiter - constant current source circuit diagram.

19. Voltage regulator with solar battery for charger.

20. Power supply with 50/60 Hz noise suppression circuit.

21. Voltage regulator with suppression for main harmonic circuit.

22. Charger powered by free energy.

23. Logic gate (7400) based voltage regulator.

24. Current source controlled by voltage.

25. Constant current source based on voltage regulator IC.

26. Switch Mode Power Supply.

27. Isolated Power supply for digital clock.

28. DC-DC converter with current multiplier.

29. DC-DC voltage converter based on Voltage Quadrupler circuit with IC CD4093.

30. Constant current source based on ТL431 IC.

31. Voltage to current convertrt.

32. Shunt voltage regulator circuit.

33. Unusual rectifier circuit diagram.

34. Powerful shunt voltage regulator.

35. Thyristor-based switching power supply.

36. Voltage regulator with current source.

37. Voltage regulator - charger.

38. DC-DC voltage converter.

39. Voltage-to-current converter drives LED.

40. DC to DC converter drives blue LED.

41. Current source, controlled by voltage.

42. Led step-up converter for flashlight.

43. IC voltage regulators connected in parallel.

44. Voltage regulator with improved stability.

45. Voltage regulator with double pulse frequency.

46. Current source.

47. Circuit with negative resistance.

48. Voltage converters with current coupling feedback.

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