0 Simple LED Lamp (Current Regulated)

This simple lamp circuit is made of very few materials. It uses high intensity white LEDs. The circuit is current regulated thus the LED is protected even the supply voltage is variable. The operation of the circuit is very similar to LED driver using LM317 regulator. The current is controlled by resistor R1 with the formula: Current = 1.2V/R1

Current regulated LED lamp schematic

Part List:

C1 - 220uF electrolytic capacitor rated 16V

R1 - 27 ohms 1W

LM317 - 317 or similar regulator IC

LED - white LED (see LED pinout in case you forget)

LM317 pinout