--- title: 555 Makes A Useful Beat Frequency Oscillator | daily.dev description: A hobbyist project describes building a beat frequency oscillator (BFO) using a 555 timer IC to enable a cheap ham radio to receive continuous-wave and... canonical: https://daily.dev/posts/555-makes-a-useful-beat-frequency-oscillator-mprs7i01a twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: 555 Makes A Useful Beat Frequency Oscillator | daily.dev og:description: A hobbyist project describes building a beat frequency oscillator (BFO) using a 555 timer IC to enable a cheap ham radio to receive continuous-wave and... og:url: https://daily.dev/posts/555-makes-a-useful-beat-frequency-oscillator-mprs7i01a og:image: https://api.daily.dev/og/posts/mPRS7I01a.png og:image:alt: 555 Makes A Useful Beat Frequency Oscillator 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. # 555 Makes A Useful Beat Frequency Oscillator **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 1 upvotes · 0 comments ## Summary A hobbyist project describes building a beat frequency oscillator (BFO) using a 555 timer IC to enable a cheap ham radio to receive continuous-wave and single-sideband suppressed-carrier transmissions. The circuit produces a tunable 455 kHz signal (±20%) injected into the receiver's intermediate frequency chain, and can run on 4.5 to 16 volts, making it easy to retrofit into most radio sets without extra power supply hardware. An alternative BFO design covered by EDN is also referenced. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How can I build a beat frequency oscillator for my ham radio using a 555 timer IC? A 555 timer IC paired with resistors and capacitors can produce a 455 kHz beat frequency oscillator that gets injected into a receiver's intermediate frequency chain, restoring the missing carrier wave needed for continuous-wave and single-sideband reception. A potentiometer allows tuning roughly plus or minus twenty percent around 455 kHz, and the circuit runs on 4.5 to 16 volts, so it fits into most existing radio sets without a separate power supply. _Ham radio tinkerers refining oscillator builds like this can find related hardware projects on daily.dev._ ### What voltage range can a 555 timer based BFO circuit operate on? The 555 timer based beat frequency oscillator circuit can run on a wide voltage range from 4.5 volts to 16 volts. This flexibility means it can be installed into just about any existing radio set without requiring a dedicated or specialized power supply, simplifying retrofits into older ham rigs. _Anyone wiring a 555 timer into an existing radio can browse similar low-voltage circuit hacks on daily.dev._ ## Similar posts on daily.dev - [A Novel 555 Circuit In 2026](https://daily.dev/posts/a-novel-555-circuit-in-2026-l4x89sr5w) · Hackaday · 0 upvotes · 0 comments - [555-Based Square-Wave And Triangle-Wave Function Generator Build For Beginners](https://daily.dev/posts/555-based-square-wave-and-triangle-wave-function-generator-build-for-beginners-yhaboxuh1) · Hackaday · 0 upvotes · 0 comments - [doin' it all with 555s](https://daily.dev/posts/doin-it-all-with-555s-xpi65kdhi) · Hacker News · 0 upvotes · 0 comments --- Tags: [#hardware](https://daily.dev/tags/hardware) [View this post on daily.dev](https://daily.dev/posts/555-makes-a-useful-beat-frequency-oscillator-mprs7i01a) ```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":"555 Makes A Useful Beat Frequency Oscillator","url":"https://daily.dev/posts/555-makes-a-useful-beat-frequency-oscillator-mprs7i01a","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/555-makes-a-useful-beat-frequency-oscillator-mprs7i01a"},"datePublished":"2026-08-22T17:29:59.719Z","dateModified":"2026-09-13T21:10:52.768Z","description":"A hobbyist project describes building a beat frequency oscillator (BFO) using a 555 timer IC to enable a cheap ham radio to receive continuous-wave and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/2dea8cf78bc813e9be06f47f1d5bb0d9?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/2dea8cf78bc813e9be06f47f1d5bb0d9?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hackaday","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hackaday","logo":"https://media.daily.dev/image/upload/s--JhDfhy70--/f_auto,q_auto/v1767541814/logos/hackaday","url":"https://daily.dev/sources/hackaday"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/555-makes-a-useful-beat-frequency-oscillator-mprs7i01a","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"hardware","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hackaday","item":"https://daily.dev/sources/hackaday"},{"@type":"ListItem","position":3,"name":"555 Makes A Useful Beat Frequency Oscillator"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/555-makes-a-useful-beat-frequency-oscillator-mprs7i01a#faq","mainEntity":[{"@type":"Question","name":"How can I build a beat frequency oscillator for my ham radio using a 555 timer IC?","acceptedAnswer":{"@type":"Answer","text":"A 555 timer IC paired with resistors and capacitors can produce a 455 kHz beat frequency oscillator that gets injected into a receiver's intermediate frequency chain, restoring the missing carrier wave needed for continuous-wave and single-sideband reception. A potentiometer allows tuning roughly plus or minus twenty percent around 455 kHz, and the circuit runs on 4.5 to 16 volts, so it fits into most existing radio sets without a separate power supply. Ham radio tinkerers refining oscillator builds like this can find related hardware projects on daily.dev."}},{"@type":"Question","name":"What voltage range can a 555 timer based BFO circuit operate on?","acceptedAnswer":{"@type":"Answer","text":"The 555 timer based beat frequency oscillator circuit can run on a wide voltage range from 4.5 volts to 16 volts. This flexibility means it can be installed into just about any existing radio set without requiring a dedicated or specialized power supply, simplifying retrofits into older ham rigs. Anyone wiring a 555 timer into an existing radio can browse similar low-voltage circuit hacks on daily.dev."}}]} ```