Converters, finders, and printable cheat sheets for the electronics bench, by TheMakersWorkbench.com. One page, six tools, no build step and no dependencies. Type values with prefixes like 4.7k or 470u, and the answers update as you type.
| Tab | What it does |
|---|---|
| Value Converter | A value in every engineering prefix. |
| Freq / Period | Frequency, period, and wavelength with antenna fractions. |
| Number Bases | Decimal, hex, binary, octal, signed values, and ASCII. |
| E-Series Finder | The nearest standard resistor or capacitor value and the best combinations. |
| I²C Addresses | A searchable address book of common chips, and a scan decoder. |
| Cheat Sheets | Printable resistor, capacitor, wire, logic-level, and formula sheets. |
Open index.html in a browser. To serve it locally: python -m http.server in this folder.
Run the tests (Node 18 or newer, no packages needed):
node --test tests/bench-logic.test.js
Load bench.css, js/bench-logic.js, and js/bench-app.js, then add:
<div class="tmwb-bench" id="tmwb-bench" data-heading="h2"></div>All styles are scoped under .tmwb-bench and sized in pixels.
drupal/tmwb_bench_tools is a Drupal 10/11 module (TMWB Bench Tools) that embeds the tool from a text-format filter. See its README.
index.html,bench.css: the page and stylesjs/bench-logic.js: all the math, no DOM access, tested in Nodejs/bench-app.js: the interfacetests/: unit testsdrupal/tmwb_bench_tools/: Drupal module (runpython scripts/sync_drupal_module.pyafter changing the tool)SOURCES.md: where each formula and data table comes from
Reference tables follow the usual standards (IEC 60062 colors, IEC 60063 values). The I2C addresses are the usual ones for common breakout boards and can change with jumpers and variants. Confirm anything critical with the datasheet.
Apache License 2.0. Free for commercial and non-commercial use. You may modify it and add to it, as long as the license, the NOTICE, and the "Developed and Maintained by TheMakersWorkbench.com" attribution stay intact.