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📡 截止频率（RC）Cutoff Frequency (RC)
f_c = 1 / (2π R C)。本地处理。可设置「电阻 Ω」、「电容 F」。f_c = 1 / (2π R C). Processed locally. Settings: Resistance Ω, Capacitance F.
使用说明与常见问题How-to & FAQ
「截止频率（RC）」是什么？What is the Cutoff Frequency (RC) tool?
f_c = 1 / (2π R C)。本地处理。可设置「电阻 Ω」、「电容 F」。f_c = 1 / (2π R C). Processed locally. Settings: Resistance Ω, Capacitance F.
如何使用「截止频率（RC）」？How do I use the Cutoff Frequency (RC) tool?
在「截止频率（RC）」中，填写「电阻 Ω」、「电容 F」等参数，结果会随输入实时计算并显示在下方。In the Cutoff Frequency (RC): Fill in "Resistance Ω", "Capacitance F"; results are recalculated instantly as you type.
能算 LC 电路吗？Does it work for LC circuits?
不能，本页只算一阶 RC 滤波器的截止频率 f_c = 1 ÷ (2πRC)。LC 电路的谐振频率是 f = 1 ÷ (2π√(LC))，RL 滤波器为 f_c = R ÷ (2πL)。No, it only gives a first-order RC filter's cutoff f_c = 1 ÷ (2πRC). An LC circuit resonates at f = 1 ÷ (2π√(LC)), and an RL filter's cutoff is f_c = R ÷ (2πL).
能举个计算实例吗？Can you show a worked example?
例如在「截止频率（RC）」中填 电阻 Ω = 1000，电容 F = 1e-6，结果区显示：截止频率 Hz：159.154943；kHz：0.159155For example, entering Resistance Ω = 1000, Capacitance F = 1e-6 in the Cutoff Frequency (RC) gives: Cutoff Hz: 159.154943; kHz: 0.159155
哪些输入会被检查？Which inputs are validated?
「截止频率（RC）」会检查这些输入——「电阻 Ω」、「电容 F」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Cutoff Frequency (RC) checks its inputs — "Resistance Ω", "Capacitance F": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「截止频率（RC）」的设置：「电阻 Ω」默认 1000；「电容 F」默认 1e-6。每次生成结果都按当前设置处理。Settings in the Cutoff Frequency (RC) — "Resistance Ω" default 1000; "Capacitance F" default 1e-6. The result always uses the current settings.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「截止频率（RC）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Cutoff Frequency (RC) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「截止频率（RC）」免费吗？需要注册吗？Is the Cutoff Frequency (RC) free? Do I need an account?
「截止频率（RC）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Cutoff Frequency (RC) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.