{"id":4062,"date":"2022-02-10T13:22:08","date_gmt":"2022-02-10T19:22:08","guid":{"rendered":"https:\/\/delphijustin.biz\/?p=4062"},"modified":"2022-02-10T13:22:08","modified_gmt":"2022-02-10T19:22:08","slug":"the-simplest-in-circuit-transistor-tester","status":"publish","type":"post","link":"https:\/\/delphijustin.biz\/the-simplest-in-circuit-transistor-tester\/","title":{"rendered":"The simplest in-circuit transistor tester"},"content":{"rendered":"\n<p>This is the simplest in circuit transistor tester. It uses two ammeters to measure the transistor gain. It is kinda like the heathkit IT-18 one but uses 2 meters instead of one. I plan on using relays for the polarity switch instead of a 5PDT Rotary switch. It uses a LM317 regulator for providing a very low voltage(around 1.25v). This will prevent turning on anything on and interfering with the gain measurements. The capacitor is to remove oscillations. I used two 8 cent 10nF capacitors in series to make 5nF. All [P] switches are all part of the polarity relays. I need a 4pdt relay and a spdt relay used to provide the 5pdt switch.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"429\" height=\"301\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/02\/transistortester.gif\" alt=\"\" class=\"wp-image-4063\"\/><figcaption>Circuit diagram<\/figcaption><\/figure><\/div>\n\n\n\n<p>How do I measure the gain?<\/p>\n\n\n\n<p>The gain is simply<\/p>\n\n\n\n<p>$$hFE=\\frac{I_c}{I_b}$$<\/p>\n\n\n\n<p>Where hFE is your gain, Ic is your collector current and Ib is your base current I did the math with the transistor in the circuit diagram and got around 195.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"522\" height=\"117\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/02\/2n4403-model.gif\" alt=\"\" class=\"wp-image-4065\"\/><figcaption>Electronics Workbench Model of 2N4403<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"396\" height=\"264\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/02\/transistortester-psu.gif\" alt=\"\" class=\"wp-image-4066\"\/><figcaption>Power Supply<\/figcaption><\/figure><\/div>\n\n\n\n<p>The collector meter is 50mA and base meter is 100uA<\/p>\n\n\n\n<p>A video will soon come when the parts come in the mail<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is the simplest in circuit transistor tester. It uses two ammeters to measure the transistor gain. It is kinda like the heathkit IT-18 one but uses 2 meters instead of one. I plan on using relays for the polarity switch instead of a 5PDT Rotary switch. It uses a LM317 regulator for providing a &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/delphijustin.biz\/the-simplest-in-circuit-transistor-tester\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;The simplest in-circuit transistor tester&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"beyondwords_generate_audio":"1","beyondwords_project_id":"17663","beyondwords_content_id":"","beyondwords_preview_token":"","beyondwords_player_style":"","beyondwords_language_id":"","beyondwords_title_voice_id":"","beyondwords_body_voice_id":"","beyondwords_summary_voice_id":"","beyondwords_error_message":"","beyondwords_disabled":"","beyondwords_delete_content":"","beyondwords_podcast_id":"5054618","beyondwords_hash":"cee7349012dab082eefa08c65e81f50525aa5976","publish_post_to_speechkit":"","speechkit_hash":"","speechkit_generate_audio":"","speechkit_project_id":"","speechkit_podcast_id":"","speechkit_error_message":"","speechkit_disabled":"","speechkit_access_key":"","speechkit_error":"","speechkit_info":"","speechkit_response":"","speechkit_retries":"","speechkit_status":"Updated","speechkit_updated_at":"","_speechkit_link":"","_speechkit_text":""},"categories":[2],"tags":[540,542,541,538,544,536,537,539,535],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/4062"}],"collection":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/comments?post=4062"}],"version-history":[{"count":2,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/4062\/revisions"}],"predecessor-version":[{"id":4067,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/4062\/revisions\/4067"}],"wp:attachment":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/media?parent=4062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/categories?post=4062"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/tags?post=4062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}