SimulationEmbed React island with click-to-activate iframes, theme sync via postMessage/MutationObserver, and graceful fallback when SpiceBook is unavailable. 12 simulations across 6 books (555 timer, op-amp, semiconductor, formulas, communications, sensor). Books without simulations render no extra markup. client:visible hydration defers JS cost until scrolled into view.
Description
Classic Forrest M. Mims III electronics reference library — digital e-book reader for the legendary Radio Shack Engineer's Mini-Notebooks
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