LED Current Limiting Resistor Calculator
Formula: current-limiting resistor = (supply voltage − LED voltage drop) / LED current
Typical LED forward voltages: red 2.0–2.2V, yellow 1.8–2.0V, white/blue 3.0–4.0V, green 2.0–3.2V
Formula: current-limiting resistor = (supply voltage − LED voltage drop) / LED current
Typical LED forward voltages: red 2.0–2.2V, yellow 1.8–2.0V, white/blue 3.0–4.0V, green 2.0–3.2V