{"id":10627,"date":"2026-01-18T01:42:54","date_gmt":"2026-01-18T01:42:54","guid":{"rendered":"https:\/\/shanyosnap.com\/?p=10627"},"modified":"2026-01-22T01:43:12","modified_gmt":"2026-01-22T01:43:12","slug":"prevent-round-metal-dome-failure-with-pcb-layout","status":"publish","type":"post","link":"https:\/\/shanyosnap.com\/ko\/prevent-round-metal-dome-failure-with-pcb-layout\/","title":{"rendered":"How To Prevent Round Metal Dome Failure With PCB Layout"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"10627\" class=\"elementor elementor-10627\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-344a79f e-flex e-con-boxed e-con e-parent\" data-id=\"344a79f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8e32ee9 elementor-widget elementor-widget-text-editor\" data-id=\"8e32ee9\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>It is a sinking feeling for any electronics designer. You get the prototype boards back, you assemble the unit, and you go to press the power button. Nothing. Or maybe it works, but it feels &#8220;mushy,&#8221; like pressing into wet cardboard. Your first instinct is to blame the switch itself. Maybe the batch was bad? Maybe the force is wrong?<\/p><p>But nine times out of ten, when a\u00a0<a href=\"https:\/\/shanyosnap.com\/ko\/product\/custom-tactile-round-metal-dome-switch\/\"><strong>\uc6d0\ud615 \uba54\ud0c8 \ub3d4<\/strong><\/a>\u00a0fails to perform, the dome is innocent. The culprit is almost always the green board underneath it. The PCB layout dictates the life, the feel, and the reliability of that switch. You can buy the most expensive, gold-plated dome in the world, but if the landing pad is designed poorly, it will fail. It\u2019s a harsh reality, but getting the copper shapes right is just as important as the mechanical assembly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-81ffb93 elementor-widget elementor-widget-heading\" data-id=\"81ffb93\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">The Geometry of the Landing Pad for a Round Metal Dome<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-14598fd elementor-widget elementor-widget-text-editor\" data-id=\"14598fd\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The basic concept seems simple enough. You have a center pad (one signal) and an outer ring (the other signal). The dome sits on the ring, and when you push the center, it touches the middle pad. Connection made. Simple, right?<\/p><p>Well, not exactly. The specific dimensions of these copper pads are critical. A common mistake is making the center pad too large. If the central copper area is too wide, the\u00a0round metal dome\u00a0will bridge the connection before it actually &#8220;snaps.&#8221; This is called &#8220;teasing&#8221; the switch. The electricity flows, but the user hasn&#8217;t felt the click yet. It creates a disconnect in the user&#8217;s brain\u2014the device reacted, but they didn&#8217;t feel the confirmation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-40b2009 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"40b2009\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/shanyosnap.com\/wp-content\/uploads\/2025\/10\/Round-Dome-Switch-e1761535740956.jpg\" class=\"attachment-full size-full wp-image-8130\" alt=\"Round Dome Switch\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62acfdc elementor-widget elementor-widget-heading\" data-id=\"62acfdc\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Optimizing the Gap Width<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04fd7dc elementor-widget elementor-widget-text-editor\" data-id=\"04fd7dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The gap between the central pad and the outer ring needs to be balanced. It shouldn&#8217;t be so small that there is a risk of shorting during assembly, but not so wide that the dome misses the target.<\/p><ul><li>Rule of Thumb:\u00a0The center pad should typically be about 40-50% of the dome&#8217;s diameter.<\/li><li>The gap is usually kept around 0.5mm to 0.8mm depending on the dome size.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a01fbf elementor-widget elementor-widget-heading\" data-id=\"6a01fbf\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Venting Strategies for Round Metal Dome Reliability<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a9c2e96 elementor-widget elementor-widget-text-editor\" data-id=\"a9c2e96\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This is the silent killer. Because a\u00a0round metal dome\u00a0has a continuous rim, it creates a very effective seal against the PCB. It\u2019s basically a suction cup.<\/p><p>When you press the button, the volume of air inside the dome decreases. That air needs to go somewhere. If the PCB is solid underneath, the air compresses and pushes back against your finger. It increases the actuation force and kills the tactile &#8220;snap.&#8221; Even worse, when you let go, the vacuum effect can hold the dome down, causing the switch to stick in the &#8220;on&#8221; position.<\/p><p>Layout designers must include vent channels. These are shallow trenches in the solder mask or actual cuts in the copper connecting the inner cavity to the outside world.<\/p><ul><li>Vias<strong>:<\/strong>\u00a0Placing a small hole (via) under the dome is the easiest way to vent air to the back of the board. However, it must be small enough that the dome dimple doesn&#8217;t get stuck in it.<\/li><li>Surface Channels:\u00a0If you can&#8217;t drill through, you need a channel in the spacer layer or a gap in the solder mask that leads the air out sideways.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f1069a0 elementor-widget elementor-widget-heading\" data-id=\"f1069a0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Surface Finish Matters for the Round Metal Dome<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f3108c2 elementor-widget elementor-widget-text-editor\" data-id=\"f3108c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The texture of the PCB surface is something you can feel through the switch. If you use a cheap finish like HASL (Hot Air Solder Leveling), the pads are bumpy. They are uneven. When the\u00a0round metal dome\u00a0sits on a lump of solder, it wobbles. It doesn&#8217;t sit flat.<\/p><p>This rocking motion causes two problems. First, it makes the click feel inconsistent. Second, it concentrates stress on specific points of the dome rim, which leads to premature cracking. The dome isn&#8217;t failing because it&#8217;s weak; it&#8217;s failing because it&#8217;s sitting on a jagged rock.<\/p><p>Recommended Finishes:<\/p><ol><li>ENIG (Electroless Nickel Immersion Gold):\u00a0This is the gold standard, literally. It is perfectly flat and resists corrosion.<\/li><li>Immersion Silver:\u00a0Good flatness and conductivity, though it can tarnish over time if not sealed well.<\/li><li>Hard Gold:\u00a0Extremely durable for high-reliability applications, though more expensive.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8fd437c elementor-widget elementor-widget-heading\" data-id=\"8fd437c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Analyzing Common Failures and PCB Fixes<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2435fa7 elementor-widget elementor-widget-text-editor\" data-id=\"2435fa7\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div style=\"overflow-x: auto; -webkit-overflow-scrolling: touch;\">\n  <table>\n    <thead>\n      <tr>\n        <th>Symptom<\/th>\n        <th>Probable PCB Layout Cause<\/th>\n        <th>The Fix<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td><strong>Switch feels &#8220;Dead&#8221; (No Snap)<\/strong><\/td>\n        <td>Lack of venting (Air trapped).<\/td>\n        <td>Add a via hole or air channel.<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Intermittent Contact (Flickering)<\/strong><\/td>\n        <td>Center pad too small or mask too thick.<\/td>\n        <td>Increase pad size or reduce mask thickness.<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Switch &#8220;Teasing&#8221; (Signal before Click)<\/strong><\/td>\n        <td>Center pad is too large\/high.<\/td>\n        <td>Shrink the center pad diameter.<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Short Circuit (Always On)<\/strong><\/td>\n        <td>Solder paste contamination.<\/td>\n        <td>Reduce stencil aperture size; keep solder away from contact area.<\/td>\n      <\/tr>\n      <tr>\n        <td><strong>Dome Cracking Early<\/strong><\/td>\n        <td>Uneven surface (HASL) or debris.<\/td>\n        <td>Switch to ENIG finish; ensure clean assembly.<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1885237 elementor-widget elementor-widget-heading\" data-id=\"1885237\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Solder Mask Considerations for Round Metal Dome Layout<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-708cdb9 elementor-widget elementor-widget-text-editor\" data-id=\"708cdb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The green stuff on the board (solder mask) has thickness. It\u2019s usually about 25 microns thick, which sounds like nothing, but in the world of micro-switches, it\u2019s a mountain.<\/p><p>If you cover the traces between the center pad and the outer ring with solder mask, you are essentially building a wall inside the switch. When the\u00a0round metal dome\u00a0tries to collapse, it might hit this wall of solder mask before it hits the center contact pad. This prevents electrical closure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-74a2f2e elementor-widget elementor-widget-heading\" data-id=\"74a2f2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Managing Contamination and Debris<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4298f06 elementor-widget elementor-widget-text-editor\" data-id=\"4298f06\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This isn&#8217;t strictly &#8220;layout,&#8221; but the layout influences it. If you place the switch pads right next to a component that requires a lot of solder paste (like a large shield or connector), you run the risk of flux and solder balls migrating under the dome during reflow.<\/p><p>Flux residue is sticky. If it gets under the dome, it acts like glue. The dome snaps down and sticks there. Or, the residue insulates the contact, and the switch stops working.<\/p><ul><li>Keep Out Zones:\u00a0Design a &#8220;keep out&#8221; zone around the\u00a0round metal dome\u00a0where no solder paste is applied.<\/li><li>Cleanliness:\u00a0If you are soldering other parts nearby, the board needs to be washed thoroughly before the domes are applied.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a91567 elementor-widget elementor-widget-text-editor\" data-id=\"5a91567\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"text-only\" data-eleid=\"3\">If you want to know more about round metal dome, please read <\/span><span style=\"font-size: 16px;\"><a href=\"https:\/\/shanyosnap.com\/ko\/round-metal-domes-key-benefits-and-common-uses\/\"><strong>Round Metal Domes: Key Benefits and Common Uses<\/strong><\/a>.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13be2f4 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"13be2f4\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/shanyosnap.com\/wp-content\/uploads\/2025\/10\/Round-Dome-Switch-16-e1761535072658.jpg\" class=\"attachment-full size-full wp-image-8172\" alt=\"\uc6d0\ud615 \uba54\ud0c8 \ub3d4\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-651acdf elementor-widget elementor-widget-heading\" data-id=\"651acdf\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\ub9ac\uc18c\uc2a4<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b7f26de elementor-widget elementor-widget-text-editor\" data-id=\"b7f26de\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Galvanic_corrosion\" target=\"_blank\" rel=\"noopener\"><strong>Galvanic Corrosion &#8211; Wikipedia<\/strong><\/a>: Understanding why mixing metals (like silver domes on tin pads) can cause long-term failure.\u00a0<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Switch#Contact_bounce\" target=\"_blank\" rel=\"noopener\"><strong>Switch Debouncing<\/strong><\/a>: A technical look at what happens electrically when a switch closes, and why stable contact is vital.\u00a0<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e357993 elementor-widget elementor-widget-heading\" data-id=\"e357993\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Add Your Heading Text Here<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4c52c04 elementor-widget elementor-widget-n-accordion\" data-id=\"4c52c04\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;expanded&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]},&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"\uc544\ucf54\ub514\uc5b8. Enter \ub610\ub294 \uc2a4\ud398\uc774\uc2a4\ub85c \ub9c1\ud06c\ub97c \uc5f4\uace0, Escape\ub85c \ub2eb\uace0, \ud654\uc0b4\ud45c \ud0a4\ub85c \ud0d0\uc0c9\ud569\ub2c8\ub2e4.\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-8000\" class=\"e-n-accordion-item\" open>\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"true\" aria-controls=\"e-n-accordion-item-8000\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Can I place a via directly in the center pad? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-8000\" class=\"elementor-element elementor-element-c98e6ce e-con-full e-flex e-con e-child\" data-id=\"c98e6ce\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d26dae8 elementor-widget elementor-widget-text-editor\" data-id=\"d26dae8\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>You can, and it is great for venting, but you have to be careful. The via should be &#8220;tented&#8221; (covered) on the back side to prevent solder from wicking up. On the top side, the hole must be small (usually &lt; 0.3mm) so the dome&#8217;s dimple doesn&#8217;t get caught in it, which would damage the tactile feel.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-8001\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-8001\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Is it better to have a solid outer ring or a broken ring? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-8001\" class=\"elementor-element elementor-element-a8fa285 e-con-full e-flex e-con e-child\" data-id=\"a8fa285\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d0ae471 elementor-widget elementor-widget-text-editor\" data-id=\"d0ae471\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>For a\u00a0round metal dome, a solid continuous ring is usually best because it provides a uniform seat for the dome rim. However, some designers use a &#8220;C&#8221; shape or a broken ring to allow for trace routing. Just ensure the gap isn&#8217;t so big that the dome tilts into it.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-8002\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-8002\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Why is my switch bouncing (double signaling)? <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-8002\" class=\"elementor-element elementor-element-0f50fed e-con-full e-flex e-con e-child\" data-id=\"0f50fed\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ce85b6a elementor-widget elementor-widget-text-editor\" data-id=\"ce85b6a\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>All mechanical switches bounce. The metal vibrates when it hits. However, if the PCB pads are oxidized or dirty, the bounce lasts longer. While software &#8220;debouncing&#8221; fixes this, a clean gold layout minimizes the physical bounce time significantly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>It is a sinking feeling for any electronics designer. You get the prototype boards back, you assemble the unit, and [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":8130,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[6,32],"tags":[],"class_list":["post-10627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","category-guide"],"acf":[],"_links":{"self":[{"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/posts\/10627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/comments?post=10627"}],"version-history":[{"count":14,"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/posts\/10627\/revisions"}],"predecessor-version":[{"id":10686,"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/posts\/10627\/revisions\/10686"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/media\/8130"}],"wp:attachment":[{"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/media?parent=10627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/categories?post=10627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shanyosnap.com\/ko\/wp-json\/wp\/v2\/tags?post=10627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}