Precision LED Regulator by LM337T

If you want to use LED with power supply many the level Voltage.Then use current be stable through. I advises try out Precision LED Regulator Circuit by IC LM337T. Use easy the a little equipment is good. By this circuit can apply to volt -5V arrive at -37V. By fine R2 for control the trend (Adjustable (+/-)15%). Part R1 if get from I LED1 = 1.5V / R1 R2 such as ILED1 = 15mA , R1 = 100 OHM.

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