--- title: Building An Analog Geiger Counter | daily.dev description: A hobbyist named ludens built an analog Geiger counter designed to measure low-level background radiation without any microcontroller. The project uses a large... canonical: https://daily.dev/posts/building-an-analog-geiger-counter-la56dfr85 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Building An Analog Geiger Counter | daily.dev og:description: A hobbyist named ludens built an analog Geiger counter designed to measure low-level background radiation without any microcontroller. The project uses a large... og:url: https://daily.dev/posts/building-an-analog-geiger-counter-la56dfr85 og:image: https://api.daily.dev/og/posts/La56dFr85.png og:image:alt: Building An Analog Geiger Counter og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Building An Analog Geiger Counter **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary A hobbyist named ludens built an analog Geiger counter designed to measure low-level background radiation without any microcontroller. The project uses a large Chinese J306β Geiger tube rated at 88 counts per minute at average background radiation, paired with an analog low-pass filter circuit to smooth readings onto a classic analog dial. A single AA battery powers the whole device via a boost circuit that generates both 5V for CMOS Schmitt trigger ICs and 400V for the tube. The device offers two measurement ranges, 1 µSv/h and 10 µSv/h, intentionally kept low since higher readings would be cause for fleeing rather than measuring. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [A Benchtop Neutron Generator For The Home Reactor](https://daily.dev/posts/a-benchtop-neutron-generator-for-the-home-reactor-pc6ugsywn) · Hackaday · 0 upvotes · 0 comments - [Replicating A Nuclear Event Detector For Fun And Probably Not Profit](https://daily.dev/posts/replicating-a-nuclear-event-detector-for-fun-and-probably-not-profit-mxea1byoi) · Hackaday · 0 upvotes · 0 comments - [A nicer voltmeter clock](https://daily.dev/posts/a-nicer-voltmeter-clock-oty8wvnel) · Hacker News · 0 upvotes · 0 comments - [This cool ESP32‑S3 project is like a Geiger counter but for finding your phone instead of radiation](https://daily.dev/posts/this-cool-esp32-s3-project-is-like-a-geiger-counter-but-for-finding-your-phone-instead-of-radiation-2n9m1mbi9) · XDA Developers · 0 upvotes · 0 comments - [DIY Weather Stations Report In From Chernobyl](https://daily.dev/posts/diy-weather-stations-report-in-from-chernobyl-u7ydnpkzv) · Hackaday · 2 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/building-an-analog-geiger-counter-la56dfr85) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Building An Analog Geiger Counter","url":"https://daily.dev/posts/building-an-analog-geiger-counter-la56dfr85","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/building-an-analog-geiger-counter-la56dfr85"},"datePublished":"2026-08-22T11:27:46.712Z","dateModified":"2026-08-22T11:28:03.595Z","description":"A hobbyist named ludens built an analog Geiger counter designed to measure low-level background radiation without any microcontroller. 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