LabBench grew to 9 tools, and I shipped a second product
LabBench grew to 9 tools, and I shipped a second product
LabBench 扩展至 9 款工具，且我发布了第二款产品
A few weeks ago I turned four free browser-based engineering demos into LabBench — a suite people could actually use, not just look at. This week it grew again, and I also launched something completely separate. 几周前，我将四个基于浏览器的免费工程演示整合成了 LabBench——一套人们真正可以使用，而不仅仅是用来观摩的工具集。本周它再次扩充，同时我还发布了一个完全独立的新产品。
Two new LabBench tools (7 → 9) EV Battery Management Simulator — a 4-cell pack model with real coulomb-counted state of charge, an OCV + IR-drop voltage curve, a lumped thermal model that trips a simulated BMS above 70°C, and passive cell balancing you can actually watch converge over time. Smart Energy Meter Dashboard — toggle household appliances and watch real vs. apparent power, power factor, a source-impedance voltage sag model, breaker-trip current logic, and live kWh billing, all computed from scratch. Both reuse the same Supabase-auth + Pro-gated save/load pattern as the rest of the suite. Try them: https://labbench-hub.vercel.app/ LabBench 新增两款工具（从 7 款增至 9 款）：电动汽车电池管理模拟器（EV Battery Management Simulator）——包含 4 节电池组模型，具备真实的库仑计数荷电状态（SOC）、开路电压（OCV）+ 内阻压降曲线、在 70°C 以上触发模拟 BMS 的集总热模型，以及你可以实时观察其收敛过程的被动电池均衡功能。智能电表仪表盘（Smart Energy Meter Dashboard）——通过切换家用电器，实时查看有功功率与视在功率、功率因数、源阻抗电压跌落模型、断路器跳闸电流逻辑以及实时 kWh 计费，所有数据均从零计算。这两款工具都沿用了该套件其余部分相同的 Supabase 身份验证 + Pro 会员限制的保存/加载模式。欢迎试用：https://labbench-hub.vercel.app/
A second, separate product: PrepBench Not ECE this time — general aptitude-exam prep (Percentage, Profit & Loss, Time & Work, Speed-Distance-Time, Number System, Probability, Squares & Cubes, Geometry, Data Interpretation). Free interactive reference + practice drills with instant feedback and a live streak/accuracy tracker, no sign-up needed, plus a paid cheat-sheet PDF bundle. Try it: https://prepbench.vercel.app/ 第二个独立产品：PrepBench。这次不再是电子与通信工程（ECE）相关，而是通用的能力倾向考试准备（涵盖百分比、盈亏、时间与工作、速度-距离-时间、数系、概率、平方与立方、几何、数据解读）。提供免费的交互式参考资料 + 带有即时反馈和实时连胜/准确率追踪的练习题，无需注册，另有付费的 PDF 速查表合集。欢迎试用：https://prepbench.vercel.app/
Both are open source under a source-available license — code’s on GitHub if you want to see how any of it works: https://github.com/Dhananjay-ku-seth Feedback welcome, especially on the battery thermal model — first time modeling BMS behavior client-side. 两者均在“源码可见”（source-available）许可下开源。如果你想了解其实现原理，代码已托管在 GitHub 上：https://github.com/Dhananjay-ku-seth。欢迎提供反馈，特别是关于电池热模型的部分——这是我第一次在客户端模拟 BMS 行为。