{"id":16438,"date":"2026-01-30T20:16:59","date_gmt":"2026-01-30T14:46:59","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16438"},"modified":"2026-01-30T20:17:01","modified_gmt":"2026-01-30T14:47:01","slug":"diy-binocular-toroid-winding-a-step-by-step-guide-for-perfect-rf-transformers","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/diy-binocular-toroid-winding-a-step-by-step-guide-for-perfect-rf-transformers\/","title":{"rendered":"DIY Binocular Toroid Winding: A Step-by-Step Guide for Perfect RF Transformers"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/Kfma7rNJ4Rg?si=ljgnQ7t7giBkwCpr\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">Building an RF transformer on a binocular (multi-aperture) core like the BN43-7051 or BN43-202 can feel like a ship-in-a-bottle project. Unlike a standard ring toroid, the &#8220;turns&#8221; here travel through two parallel holes, making the geometry a bit more technical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is a step-by-step guide to mastering the binocular wind.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. Preparation: Tools and Materials<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Core:<\/strong> Ferrite binocular cores.<\/li>\n\n\n\n<li><strong>The Wire:<\/strong> Enameled copper wire or teflon coated wire. Gauge of wire is depending on the size of the core and likely RF current. Thicker wire will be needed for output transformers.<\/li>\n\n\n\n<li><strong>The &#8220;Wand&#8221;:<\/strong> A wooden toothpick to help push wire through tight spaces without scratching the enamel.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Defining a &#8220;Turn&#8221;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The most common mistake is miscounting turns.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>The Rule:<\/strong> One full turn consists of the wire passing through <strong>both<\/strong> holes of the core once, forming a &#8220;U&#8221; shape that ends on the same side it started.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Step-by-Step Winding Process<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Step A: The First Turn<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Insert the wire into the <strong>left hole<\/strong> from the top.<\/li>\n\n\n\n<li>Loop it around the bottom and push it up through the <strong>right hole<\/strong>.<\/li>\n\n\n\n<li>Pull the wire tight so it sits flush against the center divider of the core. This is <strong>1 Turn<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Step B: Adding Successive Turns<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Take the long end of the wire and feed it back down through the <strong>left hole<\/strong>.<\/li>\n\n\n\n<li>Bring it up through the <strong>right hole<\/strong> again.<\/li>\n\n\n\n<li>This is <strong>2 Turns<\/strong>.<\/li>\n\n\n\n<li>Repeat until you reach your desired count, keeping the wires parallel and flat against each other to minimize leakage inductance.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Step C: Tapping <\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If your design requires a center tap (common in push-pull amplifiers):<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Wind half the total turns.<\/li>\n\n\n\n<li>Bring a loop of wire out, twist it slightly to mark it, and then continue winding the remaining turns in the <strong>same direction<\/strong>.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Pro-Tips for &#8220;Perfect&#8221; Transformers<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Managing the Leads<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">To keep the transformer stable on a PCB, ensure your start and end leads come out on the same side. If your turn count is a whole number (e.g., 3 turns), they will naturally exit on the same side.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Avoiding &#8220;Enamel Nicking&#8221;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Binocular cores often have sharp internal edges.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Fix:<\/strong> Before winding, you can lightly &#8220;tumble&#8221; the cores in a container with some fine sand, or simply be very gentle with your pull-through. A nicked wire causes a short-circuit to the ferrite, which is conductive enough to ruin your RF performance.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Tightness Matters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Loose turns create &#8220;stray inductance.&#8221; Use your toothpick to &#8220;dress&#8221; the wire so it hugs the center bridge of the core tightly.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Verification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Once finished, use an LCR meter or an Antenna Analyzer (like a NanoVNA) to check the results.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check Continuity:<\/strong> Ensure there is no short between the winding and the core itself.<\/li>\n\n\n\n<li><strong>Check Ratio:<\/strong> For a voltage transformer, the impedance ratio is the square of the turns ratio:\n<ul class=\"wp-block-list\">\n<li><strong>Z<sub>ratio<\/sub> = (N<sub>p<\/sub>\/N<sub>s<\/sub>)<sup>2<\/sup><\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Building an RF transformer on a binocular (multi-aperture) core like the BN43-7051 or BN43-202 can feel like a ship-in-a-bottle project. Unlike a standard ring toroid, the &#8220;turns&#8221; here travel through two parallel holes, making the geometry a bit more technical. Here is a step-by-step guide to mastering the binocular wind. 1. Preparation: Tools and Materials [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16440,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16438","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DIY Binocular Toroid Winding: A Step-by-Step Guide for Perfect RF Transformers - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/diy-binocular-toroid-winding-a-step-by-step-guide-for-perfect-rf-transformers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DIY Binocular Toroid Winding: A Step-by-Step Guide for Perfect RF Transformers - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Building an RF transformer on a binocular (multi-aperture) core like the BN43-7051 or BN43-202 can feel like a ship-in-a-bottle project. 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