{"id":4160,"date":"2022-06-17T10:57:15","date_gmt":"2022-06-17T15:57:15","guid":{"rendered":"https:\/\/delphijustin.biz\/?p=4160"},"modified":"2022-06-27T17:41:03","modified_gmt":"2022-06-27T22:41:03","slug":"simple-doorbell-alarm","status":"publish","type":"post","link":"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/","title":{"rendered":"Simple doorbell\/alarm"},"content":{"rendered":"\n<p>This is probably the simplest doorbell or alarm circuit that is out there.  The buzzer will not be constantly on since the buzzer gets switched on by a capacitor. The circuit draws hardly anything when off as you will see in the graph below. As the capacitor gets charged its current lowers down a lot. If you want to save money for parts and use a power supply use the one with the relay. The relay will make it work with a spst switch. I wish I knew that before ordering the parts<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-1 is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/16561115123775873510538246239674-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"2560\" height=\"1920\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/16561115123775873510538246239674-scaled.jpg\" alt=\"\" data-id=\"4173\" data-link=\"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/attachment\/16561115123775873510538246239674\/\" class=\"wp-image-4173\" srcset=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/16561115123775873510538246239674-scaled.jpg 2560w, https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/16561115123775873510538246239674-300x225.jpg 300w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/1656110171840120000670838106175-1-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"1920\" height=\"2560\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/1656110171840120000670838106175-1-scaled.jpg\" alt=\"\" data-id=\"4172\" data-link=\"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/1656110171840120000670838106175-2\/\" class=\"wp-image-4172\" srcset=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/1656110171840120000670838106175-1-scaled.jpg 1920w, https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/1656110171840120000670838106175-1-225x300.jpg 225w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/2022-06-18_11_47_33.gif\"><img decoding=\"async\" loading=\"lazy\" width=\"480\" height=\"480\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/2022-06-18_11_47_33.gif\" alt=\"\" data-id=\"4168\" data-link=\"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/2022-06-18_11_47_33\/\" class=\"wp-image-4168\"\/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/a-phy-ecapac-dia01e.gif\"><img decoding=\"async\" loading=\"lazy\" width=\"307\" height=\"209\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/a-phy-ecapac-dia01e.gif\" alt=\"\" data-id=\"4161\" data-link=\"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/a-phy-ecapac-dia01e\/\" class=\"wp-image-4161\"\/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/simplerbuzzer.png\"><img decoding=\"async\" loading=\"lazy\" width=\"576\" height=\"512\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/simplerbuzzer.png\" alt=\"\" data-id=\"4176\" data-link=\"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/simplerbuzzer\/\" class=\"wp-image-4176\" srcset=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/simplerbuzzer.png 576w, https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/simplerbuzzer-300x267.png 300w\" sizes=\"(max-width: 576px) 100vw, 576px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221.png\"><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"1024\" src=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221-1024x1024.png\" alt=\"\" data-id=\"4179\" data-full-url=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221.png\" data-link=\"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/adobe_express_20220625_1608410-9561012496313221\/\" class=\"wp-image-4179\" srcset=\"https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221-1024x1024.png 1024w, https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221-300x300.png 300w, https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221-150x150.png 150w, https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221-768x768.png 768w, https:\/\/delphijustin.biz\/wp-content\/uploads\/2022\/06\/Adobe_Express_20220625_1608410.9561012496313221.png 1080w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>It uses a switching transistor to turn the buzzer on and off. It&#8217;s best to use a transistor since it can take very little current to turn on. It needs a SPDT magnet alarm switch since it has to switch the capacitor between +v and transistor base resistor. You cannot use a SPST switch. I didn&#8217;t need a transistor for the buzzer since it didn&#8217;t need alot of current. <\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Doorbell alarm project finished and working\" width=\"640\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/vWyBv0QtdPQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n<script type=\"text\/javascript\" src=\"\/\/delphianserver.com\/counter\/ibuiltit.js\"><\/script>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/everycircuit.com\/circuit\/4615999028199424\/simplest-door-alarm-circuit\">See in everycircuit<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This is probably the simplest doorbell or alarm circuit that is out there. The buzzer will not be constantly on since the buzzer gets switched on by a capacitor. The circuit draws hardly anything when off as you will see in the graph below. As the capacitor gets charged its current lowers down a lot. &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/delphijustin.biz\/simple-doorbell-alarm\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Simple doorbell\/alarm&#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":"5054622","beyondwords_hash":"a852520ca98bdbcd4015356da75cab8248f5f318","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":[567,172,171,565,569,568],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/4160"}],"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=4160"}],"version-history":[{"count":5,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/4160\/revisions"}],"predecessor-version":[{"id":4183,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/posts\/4160\/revisions\/4183"}],"wp:attachment":[{"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/media?parent=4160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/categories?post=4160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/delphijustin.biz\/wp-json\/wp\/v2\/tags?post=4160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}