免费 · 建筑与行业计算
LED 限流电阻计算器.
根据电源电压、正向电压和电流计算一个或多个 LED 的串联电阻及其功率。
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使用方法: LED 限流电阻计算器
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英语技术说明
For indicator LEDs. High-power LEDs need a constant-current driver. Everything is calculated in your browser; nothing you type is uploaded.
R = (Vsupply − n × Vf) ÷ I, rounded up to the E12, E24 or E96 series; the rating is at least twice the dissipated power.
A red LED (2 V, 20 mA) on 5 V needs 150 Ω, which dissipates 60 mW: a 1/8 W resistor is enough.