{"id":16854,"date":"2026-04-08T08:00:40","date_gmt":"2026-04-08T02:30:40","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16854"},"modified":"2026-04-08T08:00:41","modified_gmt":"2026-04-08T02:30:41","slug":"comparing-forward-voltage-barrier-potential-of-diodes-for-n5ese-rf-probe","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/comparing-forward-voltage-barrier-potential-of-diodes-for-n5ese-rf-probe\/","title":{"rendered":"Comparing forward voltage (barrier potential) of diodes for N5ESE RF Probe"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/R-5oSzgAmPY?si=abecIKHfmHJxranY\" 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\">I had used 1N4148 diode instead of the 1N34A germanium diode when I homebrewed N5ESE Classic RF Probe a few days back as the latter was not available in the local shops. Now I have a received a pack of four 1N34A diodes online. I was quite surprised to see the variation in forward voltage (barrier potential) of these diodes, which varied from 0.25 to 0.4 V and one was defective. 1N4148 and 1N4007 had forward voltage of around 0.55V which would mean that the RF probe will be less sensitive if they are used instead of a good 1N34A germanium diode.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I had used 1N4148 diode instead of the 1N34A germanium diode when I homebrewed N5ESE Classic RF Probe a few days back as the latter was not available in the local shops. Now I have a received a pack of four 1N34A diodes online. I was quite surprised to see the variation in forward voltage [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16856,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16854","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>Comparing forward voltage (barrier potential) of diodes for N5ESE RF Probe - 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\/comparing-forward-voltage-barrier-potential-of-diodes-for-n5ese-rf-probe\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comparing forward voltage (barrier potential) of diodes for N5ESE RF Probe - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"I had used 1N4148 diode instead of the 1N34A germanium diode when I homebrewed N5ESE Classic RF Probe a few days back as the latter was not available in the local shops. 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