{"id":16738,"date":"2026-03-25T20:06:57","date_gmt":"2026-03-25T14:36:57","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16738"},"modified":"2026-03-25T20:06:59","modified_gmt":"2026-03-25T14:36:59","slug":"checking-voltages-at-irf510-and-total-current-in-easy-bitx","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\/","title":{"rendered":"Checking voltages at IRF510 and total current in Easy BITX"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/RXuLTrxsVzk?si=3QzUEtbV-eO5pRsW\" 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\">Set out to check the voltages at IRF510. These were the voltages which I got: Gate 1.78 V (after turning the 10K multi-turn preset about 8 turns clockwise from the full counterclockwise position with zero volts). No change with modulation with QRP dummy load connected. Drain 12.55 V, Source 0 V. 140mA current draw of Easy BITX in standby RX mode &#8211; checked with multimeter in 10A range in series to 12V battery power supply. Current drain climbs to 240 mA with PTT pressed. 240 mA with PTT pressed, no change with modulation. No copy of signals in my FT-710 radio with 40m inverted V and dummy load to Easy BITX.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Set out to check the voltages at IRF510. These were the voltages which I got: Gate 1.78 V (after turning the 10K multi-turn preset about 8 turns clockwise from the full counterclockwise position with zero volts). No change with modulation with QRP dummy load connected. Drain 12.55 V, Source 0 V. 140mA current draw of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16741,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16738","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>Checking voltages at IRF510 and total current in Easy BITX - 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\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Checking voltages at IRF510 and total current in Easy BITX - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Set out to check the voltages at IRF510. These were the voltages which I got: Gate 1.78 V (after turning the 10K multi-turn preset about 8 turns clockwise from the full counterclockwise position with zero volts). No change with modulation with QRP dummy load connected. Drain 12.55 V, Source 0 V. 140mA current draw of [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-25T14:36:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-25T14:36:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2026\/03\/Checking-voltages-at-IRF510-and-total-current-in-Easy-BITX.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1207\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"Checking voltages at IRF510 and total current in Easy BITX\",\"datePublished\":\"2026-03-25T14:36:57+00:00\",\"dateModified\":\"2026-03-25T14:36:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\\\/\"},\"wordCount\":115,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Checking-voltages-at-IRF510-and-total-current-in-Easy-BITX.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/checking-voltages-at-irf510-and-total-current-in-easy-bitx\\\/\",\"name\":\"Checking voltages at IRF510 and total current in Easy BITX - 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