{"id":16241,"date":"2026-01-02T20:39:55","date_gmt":"2026-01-02T15:09:55","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16241"},"modified":"2026-01-02T20:39:57","modified_gmt":"2026-01-02T15:09:57","slug":"while-winding-a-coil-on-toroid-should-there-be-a-minimum-distance-between-first-and-last-turn","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/while-winding-a-coil-on-toroid-should-there-be-a-minimum-distance-between-first-and-last-turn\/","title":{"rendered":"While winding a coil on toroid should there be a minimum distance between first and last turn?"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/uxGCFK3IWJE?si=YiK0i7Bcq385E58a\" 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\">Yes, there should ideally be a gap between the first and last turns of a toroidal coil. While it is physically possible to wind the wire 360\u00b0 around the core, best practices in electronics recommend leaving a <strong>30\u00b0 gap<\/strong> (occupying only about 330\u00b0 of the core). Thanks a lot VU2TDD for mentioning this important point  which I was not aware of till then!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This gap serves two primary technical purposes: reducing parasitic effects and preventing electrical failure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. Minimizing Parasitic Capacitance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When the first and last turns are placed right next to each other, they create a high &#8220;voltage differential&#8221; point.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inter-turn Capacitance:<\/strong> Every turn of a coil has a small amount of capacitance between it and its neighbor. However, the voltage difference between the first turn and the last turn is the <strong>total voltage<\/strong> across the entire inductor.<\/li>\n\n\n\n<li><strong>Self-Resonance:<\/strong> If these two ends are too close, the high capacitance between them can significantly lower the <strong>Self-Resonant Frequency (SRF)<\/strong> of the inductor. This causes the component to act like a capacitor rather than an inductor at higher frequencies.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. Preventing Voltage Breakdown (Arcing)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you are winding a transformer or an inductor for high-voltage applications, the insulation (enamel) on the wire is the only thing preventing a short circuit.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Insulation Stress:<\/strong> Adjacent turns only have a small voltage difference between them, which the thin enamel can easily handle.<\/li>\n\n\n\n<li><strong>Arcing Risk:<\/strong> Because the first and last turns represent the maximum voltage potential of the coil, placing them side-by-side puts maximum stress on the insulation. A small scratch or a voltage spike could cause the insulation to fail, leading to an internal arc-over and destroying the component.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Comparison of Winding Techniques<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>360\u00b0 Full Winding<\/th><th>330\u00b0 Winding (with 30\u00b0 Gap)<\/th><\/tr><\/thead><tbody><tr><td><strong>Inductance<\/strong><\/td><td>Slightly higher per core volume.<\/td><td>Standard calculated value.<\/td><\/tr><tr><td><strong>Capacitance<\/strong><\/td><td>High (High due to start\/end proximity).<\/td><td>Low (Minimizes capacitive coupling).<\/td><\/tr><tr><td><strong>High Frequency<\/strong><\/td><td>Poor performance; lower SRF.<\/td><td>Better; maintains inductive behavior.<\/td><\/tr><tr><td><strong>Safety<\/strong><\/td><td>High risk of arcing at high voltages.<\/td><td>Low risk; physical separation provides safety.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Practical Tip<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When winding, try to space the turns evenly around the 330\u00b0 arc. If you find you have too much or too little wire as you approach the end, it is better to slightly compress or expand the spacing of the turns rather than closing the 30\u00b0 gap. You can adjust the final inductance of the coil slightly by &#8220;spreading&#8221; or &#8220;squeezing&#8221; these turns once they are on the core.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yes, there should ideally be a gap between the first and last turns of a toroidal coil. While it is physically possible to wind the wire 360\u00b0 around the core, best practices in electronics recommend leaving a 30\u00b0 gap (occupying only about 330\u00b0 of the core). Thanks a lot VU2TDD for mentioning this important point [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16242,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16241","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 v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>While winding a coil on toroid should there be a minimum distance between first and last turn? - 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\/while-winding-a-coil-on-toroid-should-there-be-a-minimum-distance-between-first-and-last-turn\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"While winding a coil on toroid should there be a minimum distance between first and last turn? - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Yes, there should ideally be a gap between the first and last turns of a toroidal coil. While it is physically possible to wind the wire 360\u00b0 around the core, best practices in electronics recommend leaving a 30\u00b0 gap (occupying only about 330\u00b0 of the core). 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