{"id":208,"date":"2015-03-01T03:25:17","date_gmt":"2015-03-01T03:25:17","guid":{"rendered":"http:\/\/paksc.org\/pk\/?p=208"},"modified":"2015-03-01T03:25:17","modified_gmt":"2015-03-01T03:25:17","slug":"variable-dc-power-supply","status":"publish","type":"post","link":"https:\/\/paksc.org\/pk\/electronics\/variable-dc-power-supply\/","title":{"rendered":"How to Make Variable DC Power Supply"},"content":{"rendered":"<figure id=\"attachment_209\" aria-describedby=\"caption-attachment-209\" style=\"width: 625px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/paksc.org\/pk\/wp-content\/uploads\/2015\/03\/variable-dc-power-supply-2.jpg\" data-wpel-link=\"internal\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-209\" src=\"http:\/\/paksc.org\/pk\/wp-content\/uploads\/2015\/03\/variable-dc-power-supply-2.jpg\" alt=\" How to Make Variable DC Power Supply \" width=\"625\" height=\"405\" srcset=\"https:\/\/paksc.org\/pk\/wp-content\/uploads\/2015\/03\/variable-dc-power-supply-2.jpg 625w, https:\/\/paksc.org\/pk\/wp-content\/uploads\/2015\/03\/variable-dc-power-supply-2-300x194.jpg 300w, https:\/\/paksc.org\/pk\/wp-content\/uploads\/2015\/03\/variable-dc-power-supply-2-170x110.jpg 170w, https:\/\/paksc.org\/pk\/wp-content\/uploads\/2015\/03\/variable-dc-power-supply-2-370x240.jpg 370w, https:\/\/paksc.org\/pk\/wp-content\/uploads\/2015\/03\/variable-dc-power-supply-2-400x259.jpg 400w\" sizes=\"auto, (max-width: 625px) 100vw, 625px\" \/><\/a><figcaption id=\"caption-attachment-209\" class=\"wp-caption-text\">How to Make Variable DC Power Supply<\/figcaption><\/figure>\n<h1>Fully Regulated Variable DC Power Supply<\/h1>\n<p>Project by: Engineer<strong> Hafiz Yasir Quresh<\/strong>i NUST Pakistan<\/p>\n<p>Introduction<\/p>\n<p>The project \u201cVariable DC Power Supply\u201d plays a very important role in the laboratory functions and that is mainly to the electronics labs. As in electronics all the instruments, components work on a particular regulated dc supply, so a project which can provide this supply by converting the alternating current to direct current that too into a great range of regulated power keep its own preference. As it can produce a range of 0-30 v direct current by regulating and converting alternating current is has a vast application too. AC to DC converters generally comprise a rectifier bridge to rectify the AC current of the input line and a regulating device supplying on output of one or more regulated DC voltages. Just the simple\u00a0AC is applied, simple electronic circuit is used and through potentiometer you get the desired regulated dc power supply.<\/p>\n<h3>Components required to make Variable DC power supply<\/h3>\n<p>To make Variable DC power supply, you will required following list of components;<\/p>\n<ul>\n<li><a title=\"How to Make a Electric Transformer Rewinding for inverter, UPS, Devices\" href=\"http:\/\/paksc.org\/pk\/articles\/how-to-make-a-transformer-for-inverter-ups-devices\/\" data-wpel-link=\"internal\">Transformer<\/a> 220V to 30V ,2A rating.<\/li>\n<li>Diodes<\/li>\n<li>High capacitance capacitor (1800uF)<\/li>\n<li>Small capacitors for IC.<\/li>\n<li>IC LM317<\/li>\n<li>Resistors of 500 ohms.<\/li>\n<li>1.5A fuse.<\/li>\n<li>Probes .<\/li>\n<li>Digital voltmeter (for output reading).<\/li>\n<li>Crocodile clips.<\/li>\n<\/ul>\n<h3>Construction and Working<\/h3>\n<p>As a student of electrical engineering I always strive for practical work along with my studies. Now I have made this adjustable DC power supply which is more economical and safe to use for any purpose which requires the DC power. The knowledge used is of basic electronics and power.<br \/>\nThis power supply can give you DC voltage of desired value just by rotating the knob. The output voltage will be shown on the digital voltmeter of the power supply.<br \/>\nInitially a step down transformer reduces the voltage level from 220V to 30 V AC.then the rectifier rectifies the output voltage of the transformer.<\/p>\n<p>Across the capacitor we get almost 30 V DC voltages. This voltage is applied to the input of the variable voltage regulator IC LM317 which has a variable resistor in terminal 1 which will be used as the voltage adjusting knob, because by changing the value of that resistor the output voltage of the IC varies from 2V to 30V. The formula for the output voltage of the IC by variation of resistance is given by:<\/p>\n<p><img decoding=\"async\" class=\"caption\" title=\"Variable DC Power Supply\" src=\"http:\/\/paksc.org\/pk-001\/images\/stories\/variable%20dc%20power%20supply.jpg\" alt=\"Variable DC Power Supply\" border=\"0\" \/><\/p>\n<p>for the safety of the users a fuse is also used which prevents the supply from over current flow<\/p>\n<h3>Circuit diagram<\/h3>\n<p>Circuit made on proteus isis<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" title=\"Circuit diagram\" src=\"http:\/\/paksc.org\/pk-001\/images\/stories\/variable%20dc%20power%20supply%20circuit%20diagram.jpg\" alt=\"Circuit diagram\" width=\"594\" height=\"374\" border=\"0\" \/><\/p>\n<h3>Salient Features<\/h3>\n<ul>\n<li>Fully regulated 2V \u2013 30V supply.<\/li>\n<li>Can be used as charger which can charge a number of phones simultaneously as current rating is about 2A.<\/li>\n<li>Can be used for charging automobile batteries.<\/li>\n<li>Priceless instrument for electronics laboratory.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Precautions<\/h3>\n<p>Do connect the device which draws more than 2A current with this power supply.<br \/>\nHold the clips of the probes through their insulations.<br \/>\nDo not short the probes while supply is ON.<\/p>\n<h3>Project Photos<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"caption\" title=\"Variable DC Power Supply 1\" src=\"http:\/\/paksc.org\/pk-001\/images\/stories\/variable%20dc%20power%20supply%201.jpg\" alt=\"Variable DC Power Supply 1\" width=\"571\" height=\"427\" border=\"0\" \/><\/p>\n<h3>Variable DC Power Supply Picture 1<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/paksc.org\/pk-001\/images\/stories\/variable%20dc%20power%20supply%202.jpg\" alt=\"\" width=\"573\" height=\"371\" border=\"0\" \/><\/p>\n<h3>The Variable DC Power Supply picture 2<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"caption\" title=\"Variable DC Power Supply 3\" src=\"http:\/\/paksc.org\/pk-001\/images\/stories\/variable%20dc%20power%20supply%203.jpg\" alt=\"Variable DC Power Supply 3\" width=\"581\" height=\"436\" border=\"0\" \/><\/p>\n<h3>Variable DC Power Supply picture 3<\/h3>\n<p>Ask Question about Project Visit PSC Forum: <a id=\"tid_31\" class=\"subject_editable subject_old\" title=\"(Click and hold to edit)\" href=\"http:\/\/forum.paksc.org\/Thread-Variable-DC-Variable-DC-Power-Supply-Power-Supply-Project-by-Yasir-Qureshi\" data-wpel-link=\"internal\">Variable DC (Variable DC Power Supply ) Power Supply Project by Yasir Qureshi<\/a><\/p>\n<h3><strong>Learn Arduino<\/strong><\/h3>\n<ul>\n<li class=\"entry-title\"><strong><a title=\"Arduino Tutorial in Urdu: Arduino Course for Beginners and advanced\" href=\"http:\/\/paksc.org\/pk\/electronics\/arduino-course-for-beginners-and-advanced\/\" data-wpel-link=\"internal\">Arduino Tutorial in Urdu: Arduino Course for Beginners and advanced<\/a><\/strong><\/li>\n<li class=\"entry-title\"><a title=\"Basics of Arduino Board (UNOR3)\" href=\"http:\/\/paksc.org\/pk\/electronics\/basics-of-arduino-board-unor3\/\" data-wpel-link=\"internal\">Arduino tutorial # 1 in Urdu Basics of arduino, installation, configuration<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Basics of Arduino Board (UNOR3)\" href=\"http:\/\/paksc.org\/pk\/electronics\/basics-of-arduino-board-unor3\/\" data-wpel-link=\"internal\">Arduino tutorial # 2 in Urdu, Introduction to Arduino Board: UNOR3<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Arduino Lesson number 3 in Urdu, Multiple Blinking LED\" href=\"http:\/\/paksc.org\/pk\/electronics\/arduino-lesson-number-3-in-urdu-multiple-blinking-led\/\" data-wpel-link=\"internal\">Arduino tutorial #3 in Urdu, Multiple Blinking LED on the Arduino<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Build Automatic Night Light Control or Switch with Arduino\" href=\"http:\/\/paksc.org\/pk\/electronics\/build-automatic-night-light-control-or-switch-with-arduino\/\" data-wpel-link=\"internal\">Arduino tutorial #4 in Urdu, LED\u2019s Controlling with Switches<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Arduino Lesson #5 Servo Motor Controlling with Joystick\" href=\"http:\/\/paksc.org\/pk\/electronics\/arduino-lesson-5-servo-motor-controlling-with-joystick\/\" data-wpel-link=\"internal\">Arduino tutorial #5 in Urdu, Servo Motor Controlling with Joystick<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Controlling LED\u2019s Wirelessly Via Bluetooth\" href=\"http:\/\/paksc.org\/pk\/electronics\/controlling-leds-wirelessly-via-bluetooth\/\" data-wpel-link=\"internal\">Arduino tutorial #6 in Urdu, Controlling LED\u2019s Wirelessly Via Bluetooth<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Experiment with LDR and Arduino\" href=\"http:\/\/paksc.org\/pk\/electronics\/experiment-with-ldr-and-arduino\/\" data-wpel-link=\"internal\">Arduino tutorial #7 in Urdu, Experiment with LDR and Arduino<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Build Automatic Night Light Control or Switch with Arduino\" href=\"http:\/\/paksc.org\/pk\/electronics\/build-automatic-night-light-control-or-switch-with-arduino\/\" data-wpel-link=\"internal\">Arduino tutorial #8 in Urdu, Arduino Controllable Light switch<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Water level Indicator using arduino\" href=\"http:\/\/paksc.org\/pk\/electronics\/water-level-indicator-using-arduino\/\" data-wpel-link=\"internal\">Arduino tutorial #9 in Urdu, Arduino Water level Indicator<\/a><\/li>\n<li class=\"entry-title\"><a title=\"Distance sensing with ultrasonic sensor via Arduino\" href=\"http:\/\/paksc.org\/pk\/electronics\/distance-sensing-with-ultrasonic-sensor-via-arduino\/\" data-wpel-link=\"internal\">Arduino tutorial #10 in Urdu, Distance sensing with ultrasonic sensor and Arduino.<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Fully Regulated Variable DC Power Supply Project by: Engineer Hafiz Yasir Qureshi NUST Pakistan Introduction The project \u201cVariable DC Power Supply\u201d plays a very important role in the laboratory functions and that is mainly to the electronics labs. As in electronics all the instruments, components work on a particular regulated dc supply, so a project&#8230;<\/p>\n","protected":false},"author":9,"featured_media":209,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[2],"tags":[5,3],"class_list":["post-208","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electronics","tag-class-9th-to-12th","tag-semester-project"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Make Variable DC Power Supply -<\/title>\n<meta name=\"description\" content=\"The article is for the initial level engineering students to make variable DC power supply. 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