{"id":1861,"date":"2024-08-14T05:40:58","date_gmt":"2024-08-13T22:40:58","guid":{"rendered":"https:\/\/www.tneutron.net\/mikro\/?p=1861"},"modified":"2024-08-13T07:55:53","modified_gmt":"2024-08-13T00:55:53","slug":"basic-circuit-of-photo-transistor-sensors","status":"publish","type":"post","link":"https:\/\/www.tneutron.net\/mikro\/basic-circuit-of-photo-transistor-sensors\/","title":{"rendered":"Basic Circuit of Photo Transistor Sensors"},"content":{"rendered":"<p><span class=\"notranslate\">This component has the same properties as the transistor that produces the cut off and saturation conditions.<\/span> <span class=\"notranslate\"> The difference is, when the transistor cutoff condition occurs when no current flows through the base to the emitter and saturation conditions occur when there is current flowing through the base to the emitter then the phototransistor cutoff condition occurs when no infrared light is received and saturation conditions occur when there is infrared light received.<\/span><br \/>\n<a href=\"https:\/\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2017\/09\/clip_image006.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"clip_image006\" src=\"https:\/\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2017\/09\/clip_image006_thumb.jpg\" alt=\"clip_image006\" width=\"244\" height=\"153\" border=\"0\" \/><\/a><\/p>\n<p><span class=\"notranslate\"> The cut off condition is the condition in which the transistor is in the OFF state so that the current from the collector does not flow to the emitter.<\/span> <span class=\"notranslate\"> In the series above picture, the current will flow and bias base transistor Q2 C9014.<\/span> <span class=\"notranslate\"> The saturation condition is a condition in which the transistor is in ON state so that the current from the collector flows into the emitter and causes the transistor Q2 to not get biased or OFF.<\/span> <span class=\"notranslate\"> The ST8-LR2 phototransistor has a 15-degree corner area and a blue protective layer that protects the sensor from wild lights.<\/span> <span class=\"notranslate\"> In phototransistors that are not equipped with this protective layer, wild lights can lead to false indications sent to the CPU and disrupt the processes that are there.<\/span><\/p>\n<p><span class=\"notranslate\"> The application of this component as a touch sensor is used in conjunction with Infrared LEDs emitted to the ground.<\/span> <span class=\"notranslate\"> When the ground or floor surface is light, the infrared signal will be returned to the sensor and received by ST8-LR2.<\/span> <span class=\"notranslate\"> But if the surface of the ground or floor is dark, then the infrared signal will be absorbed and little or no return.<\/span> <span class=\"notranslate\"> How to arrange Photo transistor can be seen in the picture below<\/span><br \/>\n<a href=\"https:\/\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2017\/09\/clip_image009-1.jpg\"><img loading=\"lazy\" decoding=\"async\" title=\"clip_image009\" src=\"https:\/\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2017\/09\/clip_image009_thumb-1.jpg\" alt=\"clip_image009\" width=\"351\" height=\"134\" border=\"0\" \/><\/a><\/p>\n<p><span class=\"notranslate\"> Photo transistor is a light sensor that can be used for applications with infrared light and sunlight.<\/span> <span class=\"notranslate\"> Photo transistors can be operated directly to obtain the output logic from the light changes received by the photo transistor or by adding transistor boosters to improve the performance and speed of the photo transistor response.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This component has the same properties as the transistor that produces the cut off and saturation conditions. The difference is, when the transistor cutoff condition occurs when no current flows through the base to the emitter and saturation conditions occur when there is current flowing through the base to the emitter then the phototransistor cutoff &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1238],"tags":[2914,2915,2916,2322,2170,2917,2918,2919,2920,2921,2922,2923,2924,2925,2926,2927,2928,2929,2930,2931,2932,2933,2934],"class_list":["post-1861","post","type-post","status-publish","format-standard","hentry","category-english","tag-12v-phototransistor-circuit","tag-2n5777-phototransistor-circuit","tag-3-pin-phototransistor-circuit","tag-ambient-light-phototransistor-circuit","tag-circuit-diagram-for-phototransistor","tag-circuit-diagram-of-phototransistor","tag-circuit-for-phototransistor","tag-circuit-of-phototransistor","tag-circuit-phototransistor","tag-circuit-symbol-of-phototransistor","tag-circuit-using-phototransistor","tag-circuit-with-phototransistor","tag-common-collector-phototransistor-circuit","tag-common-emitter-phototransistor-circuit","tag-dark-detector-circuit-phototransistor","tag-driver-circuit-for-phototransistor","tag-fast-phototransistor-circuit","tag-high-speed-phototransistor-circuit","tag-infrared-phototransistor-circuit","tag-ir-photo-transistor-circuit","tag-ir-phototransistor-circuit-diagram","tag-l14f1-phototransistor-circuit","tag-l14g1-phototransistor-circuit"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Basic Circuit of Photo Transistor Sensors - TN Mikro<\/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:\/\/www.tneutron.net\/mikro\/basic-circuit-of-photo-transistor-sensors\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Basic Circuit of Photo Transistor Sensors - TN Mikro\" \/>\n<meta name=\"twitter:description\" content=\"This component has the same properties as the transistor that produces the cut off and saturation conditions. The difference is, when the transistor cutoff condition occurs when no current flows through the base to the emitter and saturation conditions occur when there is current flowing through the base to the emitter then the phototransistor cutoff ...\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2017\/09\/clip_image006_thumb.jpg\" \/>\n<meta name=\"twitter:creator\" content=\"@t_neutron\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Taufiqullah\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/basic-circuit-of-photo-transistor-sensors\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/basic-circuit-of-photo-transistor-sensors\\\/\"},\"author\":{\"name\":\"Taufiqullah\",\"@id\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/#\\\/schema\\\/person\\\/b57f791b694136047454bb6ac5cbe375\"},\"headline\":\"Basic Circuit of Photo Transistor Sensors\",\"datePublished\":\"2024-08-13T22:40:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/basic-circuit-of-photo-transistor-sensors\\\/\"},\"wordCount\":338,\"image\":{\"@id\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/basic-circuit-of-photo-transistor-sensors\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/wp-content\\\/uploads\\\/sites\\\/5\\\/2017\\\/09\\\/clip_image006_thumb.jpg\",\"keywords\":[\"12v phototransistor circuit\",\"2n5777 phototransistor circuit\",\"3 pin phototransistor circuit\",\"ambient light phototransistor circuit\",\"circuit diagram for phototransistor\",\"circuit diagram of phototransistor\",\"circuit for phototransistor\",\"circuit of phototransistor\",\"circuit phototransistor\",\"circuit symbol of phototransistor\",\"circuit using phototransistor\",\"circuit with phototransistor\",\"common collector phototransistor circuit\",\"common emitter phototransistor circuit\",\"dark detector circuit phototransistor\",\"driver circuit for phototransistor\",\"fast phototransistor circuit\",\"high speed phototransistor circuit\",\"infrared phototransistor circuit\",\"ir photo transistor circuit\",\"ir phototransistor circuit diagram\",\"l14f1 phototransistor circuit\",\"l14g1 phototransistor circuit\"],\"articleSection\":[\"English\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/basic-circuit-of-photo-transistor-sensors\\\/\",\"url\":\"https:\\\/\\\/www.tneutron.net\\\/mikro\\\/basic-circuit-of-photo-transistor-sensors\\\/\",\"name\":\"Basic Circuit of Photo Transistor Sensors - 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