电子产品

免费放大器功率计算器 — 使用欧姆定律计算输出功率、RMS/峰值/峰峰值电压和电流。根据SPL基础的功率要求、余量分析和热耗散估算，声学地选择放大器，适用于A类、AB类和D类放大器。

Free antenna length calculator for dipole, quarter-wave vertical, full-wave loop, inverted vee, 5/8-wave vertical, and 3-element Yagi antennas. Get exact lengths in both feet and meters instantly.

Free battery capacity calculator for runtime, charge time, and energy storage. Calculate how long your battery will last, how long it takes to charge, and design series/parallel battery banks.

Free Battery Runtime Calculator — estimate how long your battery will last under any load. Supports Standard (Ah/Wh), Peukert lead-acid, and IoT duty-cycle modes with chemistry presets and scenario comparison.

Free Dipole Antenna Calculator — compute half-wave, folded dipole, inverted vee, and full-wave antenna lengths in feet and meters from frequency. Includes velocity factor, impedance, balun recommendations, and ham radio band presets.

Free PCB Trace Width Calculator based on IPC-2221 and IPC-2152 standards. Calculate the minimum copper trace width required to safely carry a given current with your chosen temperature rise, copper weight, and layer type.

Free PCB via size calculator using IPC-2221 and IPC-2152 standards. Calculate via current capacity, resistance, voltage drop, power loss, aspect ratio, annular ring, inductance, and capacitance for through-hole, blind, buried, and microvias.

Free RC (Resistor-Capacitor) Time Constant (τ) calculator — compute τ = R × C, cutoff frequency, rise time, energy stored, and charging/discharging curves. Supports RC and RL circuits with solve-for-any mode.

Free Solar Panel Calculator — estimate the number of panels, system size, battery storage, and 25-year payback for residential and off-grid solar installations.

免费扬声器分频计算器 — 设计2路和3路扬声器系统的被动分频网络。计算巴特沃斯、林克维茨-赖利、贝塞尔和切比雪夫滤波器的电容器（µF）和电感器（mH）值，并支持佐贝尔和L型衰减。