--- title: Fixing A Dodgy Cheap Audio DAC | daily.dev description: A cheap HDMI-to-VGA converter with onboard audio wasn't working due to its delta-sigma DAC's switching frequency leaking into the output — a sign the output... canonical: https://daily.dev/posts/fixing-a-dodgy-cheap-audio-dac-arbboy7y6 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Fixing A Dodgy Cheap Audio DAC | daily.dev og:description: A cheap HDMI-to-VGA converter with onboard audio wasn't working due to its delta-sigma DAC's switching frequency leaking into the output — a sign the output... og:url: https://daily.dev/posts/fixing-a-dodgy-cheap-audio-dac-arbboy7y6 og:image: https://api.daily.dev/og/posts/aRbboY7y6.png og:image:alt: Fixing A Dodgy Cheap Audio DAC 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. # Fixing A Dodgy Cheap Audio DAC **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary A cheap HDMI-to-VGA converter with onboard audio wasn't working due to its delta-sigma DAC's switching frequency leaking into the output — a sign the output filter was failing. The investigation led to an in-depth exploration of filter design and the role of impedance in filter behavior, ultimately resulting in a custom replacement filter to fix the device. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Your expensive headphones sound worse than they should, and the fix has nothing to do with them](https://daily.dev/posts/your-expensive-headphones-sound-worse-than-they-should-and-the-fix-has-nothing-to-do-with-them-mzuxw87su) · XDA Developers · 0 upvotes · 0 comments - [Learning About Ground Loop Isolators Thanks To A Scam Product](https://daily.dev/posts/learning-about-ground-loop-isolators-thanks-to-a-scam-product-gxptwqa01) · Hackaday · 0 upvotes · 0 comments - [I stopped using motherboard audio after one cheap USB DAC solved every problem I had](https://daily.dev/posts/i-stopped-using-motherboard-audio-after-one-cheap-usb-dac-solved-every-problem-i-had-hcpqmdxvq) · XDA Developers · 0 upvotes · 0 comments - [Inside a 1980s filter chip that uses switched capacitors](https://daily.dev/posts/inside-a-1980s-filter-chip-that-uses-switched-capacitors-fl6obnvvh) · Lobsters · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/fixing-a-dodgy-cheap-audio-dac-arbboy7y6) ```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":"Fixing A Dodgy Cheap Audio DAC","url":"https://daily.dev/posts/fixing-a-dodgy-cheap-audio-dac-arbboy7y6","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/fixing-a-dodgy-cheap-audio-dac-arbboy7y6"},"datePublished":"2026-07-09T11:07:47.813Z","dateModified":"2026-07-09T11:08:06.581Z","description":"A cheap HDMI-to-VGA converter with onboard audio wasn't working due to its delta-sigma DAC's switching frequency leaking into the output — a sign the output...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/8041700a862c9cdf3fa32762ac86fd0c?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/8041700a862c9cdf3fa32762ac86fd0c?_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/fixing-a-dodgy-cheap-audio-dac-arbboy7y6","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"","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":"Fixing A Dodgy Cheap Audio DAC"}]} ```