ProcirelThe short version
Every tutorial on Procirel is physically built, measured and verified before it is published. That sentence is the whole pitch. The rest of this page explains what it means in practice, why it is rarer than it should be, and what it buys you as a reader.
What “bench-tested” actually means
Many electronics sites assemble tutorials from other tutorials. The wiring diagram looks plausible, the code compiles, and nobody ever built the thing. It works well enough for search traffic and terribly for readers, whose breadboard does not care about plausibility.
Our process is different in one specific way: the circuit exists first, the tutorial second. We build the project on a real bench. We measure the voltages, currents, timings and ripple with real instruments. We photograph the actual build. The numbers in the worked example are the numbers our meters showed, and if a capacitor placement mattered, we moved the capacitor and measured the difference. The famous example on this site is the ESP32 brownout guide: the scope traces in it are real captures of a real fault, which is why readers keep reporting it fixed problems three forums could not.
Five things you get on every page
1. Complete circuit diagrams.Proper schematics plus breadboard wiring, drawn from the built article, not sketched from imagination.2. Numbers with conditions.A regulator dropout quoted at its maximum rating, not the typical that flatters it. Test conditions stated, so your reproduction should match within rounding.3. Working, commented code.The sketch we uploaded is the sketch you get, with the reasoning on the lines that need it.4. Documented failure modes.Each guide lists what went wrong on our bench and how we fixed it, because the mistakes are the education.5. A maintenance date. Guides carry review dates, and price/tool-sensitive content gets re-verified on a schedule instead of rotting quietly.
Who the site is for
Studentsuse it as the reference their lectures assume: the version of each topic with real component values instead of abstract symbols.Hobbyists and makersfollow the structured tracks, fundamentals through Arduino to IoT, each track linking its guides in dependency order.Working engineers keep the twenty calculators bookmarked, precisely because every tool shows the formula and the standard behind it, so results can be cited rather than trusted.
What we are not
We are not a content farm, and we do not pretend to be neutral about it. We publish fewer guides, longer, with evidence. We do not take payment for coverage, we do not run affiliate links dressed as reviews, and we do not publish a tutorial because a keyword tool said the volume was attractive. If a topic is worth covering, it is worth benching first.
We are also not a paywall. Every tutorial, every calculator, always free, no account required for anything except optional downloads. The site exists because good electronics education was either too shallow, too expensive, or both.
The checks that keep us honest
Every guide passes the workflow documented on the editorial process page: datasheet verification, measured values, safety review for mains and battery content, and public, dated corrections when we get something wrong. The correction policy deserves emphasis, because it is the one readers can verify: when we fix an error, the fix is visible, and reader reports are credited. A site that never admits mistakes is not making fewer of them.
Start anywhere
New to electronics? Begin with the Electronics Fundamentals complete guide. Know what you want to build? The category index lists every track. In a hurry? The calculator toolbox answers most sizing questions in seconds.
If you build something from these pages, we would genuinely like to hear about it through the contact page, successes and corrections alike.
Frequently asked questions
Is everything really free?
Yes, every tutorial and all twenty calculators, no account, no paywall. Optional file downloads may ask for a free registration, nothing else does.
Can I use your circuits in commercial products?
The knowledge is yours to use; the text and images are copyrighted. Cite us when you can, and read the disclaimer for the engineering realities of production use.
Which track should a complete beginner start?
The Electronics Fundamentals pillar, then an Arduino starter kit with the Arduino track. Most readers reach a working sensor project inside a month of casual evenings.
Do you take requests?
Gladly, through the contact page. Requests that recur in the inbox get scheduled; that is how several existing guides were born.
How current is the content?
Every guide carries a review date; tool and pricing content is re-verified on a rolling schedule. Corrections are public and dated.
Why should I trust one author over a big site?
Because you can check the work. One named engineer, one documented process, measurements you can reproduce and a corrections record, versus an anonymous roster with neither.