Electronics
LED Resistor Calculator
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Red
Green
Blue
White
Supply voltage
V
LED forward voltage
V
Target current
mA
Series LEDs
pcs
Parallel strings
strings
Assumes one resistor per LED string. Sharing one resistor across parallel LEDs can make brightness and current uneven.
Suggested standard resistor
150 Ω
Required resistor: 150 Ω · Suggested rating: 0.125 W
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Voltage across resistor
3 V
Resistor power
0.06 W
Total current
20 mA
LED power
0.04 W