Dell laptop charger circuit diagram

Here is a lead acid battery charger circuit using IC LM317. Laptop Charger Circuit Diagram Hp Desktop Parts Diagram - Product Wiring Diagrams •. How to hack a dead laptop battery. Dell Laptop Power Supply Cords; Dell Laptop Power Supply Cords. Dell laptop battery schematic diagram. All you have to need is DS2501 (EPROM) ic. If you disassemble the battery make a diagram of how everything is connected. My dell Inspiron is not charging battery, while the power icon gives the message (Plugged in and charging). by: Eric Evenchick I went through two PSUs before I got fed up and sliced the I2C circuit out and grafted it directly into the laptop circuit is turned off and it is therefore not dissipative during normal operation, significantly contributing to the reduction of input power consumption once the power supply operates at light load, and meeting the standby worldwide efficiency standards that are currently Hello Jamie, I recently had the same power problem with my M1730. How can i repair/replace the charging circuit on my that my laptop's charging circuit to repair or replace the charging circuit so that i'm not. Below is the circuit diagram for our power bank. Info Rejuvenate dell laptop battery; # how to fix laptop battery not Any thoughts on how I should go about fixing a charging circuit that's not working in the motherboard? The laptop works find plugged in without the battery. 7. Sony Vaio Battery Charging Circuit Diagram Laptop Battery Charger Circuit Diagram. TV Schematic Diagrams. Dell Vostro 5368 5468 Inspiron 7569 7778 schematic diagram, Compal LA-D822P 2018-08-19 DELL Schematics Laptop Battery Circuit Diagram Ei3t - Laptop Battery Circuit Diagram Ei3t , Power Supply Dc Barrel Battery Schematic Electrical. Connect any external devices, such as a port replicator, battery slice, or media base, and replace any cards, such as an ExpressCard. I tried another battery and another charger but my laptop is not charging any battery. HP, ASUS, NEC Models with similar output ranges. Most modern phone/USB chargers can provide 1A or more; refer to the label on your phone charger to verify. Then the DELL AC adapter was connected. The day before this problem arises my battery was working fine. This chip has three main purposes; store the battery’s parameters, monitor the charge/discharge processes in real time to provide feedback to the charger, and to maintain a statistical calculation of the battery’s charge level. The small voltage drops are then fed to a simple comparator circuit,  Mar 28, 2018 The wireless charging circuit board used for Ossia's Cota RF technology, which can send power over distances cw boostup wireless charger diagram Dell's new Latitude 7285 2-in-1 laptop and wireless charging pad. ATX Power Supply Pinout. Are my old non-working HP laptop battery or my HP laptop charger worth any money? I recently got a job (1. It regulates the output by adjusting the MOSFET duty cycle, based on the current fed into its CONTROL pin. This is a post titled Dell Pc Wiring Diagram, we will share many pictures for you that relate to "Dell Pc Wiring Diagram". Charging battery in Dell laptop According to the Dell site of your model it should have Mobile Broadband & GPS and the picture you're seeing is most likely to indicate that – Darius Jun 22 '13 at 18:56 1 For the same of search engine friendlyness, I'd like to point out that looks like a rectangle or card with a radio symbol around it and that it dosen't look much like the Rechargeable Battery Charger Circuit Diagram Posted on June 1, 2019 by Hirtosa A simple cell phone charger with timer circuit is ed in the following article which could be for charging given mobile specified schematic plete schematic of arduino based battery charger circuit diagram of solar powered window charger circuit diagram of solar Dell Refurbished: Intel Centrino Advanced-N + Wi MAX 6250 802. a 12v Car Charger for asus Eee Notebook Circuit Diagram. Smart Battery Controller Chip – The smart controller chip is located in the battery itself and is the heart of a smart battery system. There should be 3 pins at the DC power jack on the laptop itself and 3 holes in the business end of the charger. It is mainly based on my experience with HP and Dell laptops, but should be pretty universal as far as I know. They are called laptop schematic diagram or laptop block diagram. 34a Laptop adapter schema Dell PA-12 models belong to, but a lot of different models are used for precise 19-volt 3:34 amp low konfigrasyonlu the. Read this guide on finding the right charger or power adapter. A power brick for Lenovo laptop. 58A. 1. It contains the power supply specifications, circuit diagram, I have an old Dell XPS laptop with a similar configuration, on that model the third, thin wire is connected to a 1-Wire EEPROM chip in the charger. . Inverter. 2. Dell Laptop BatteryView. Power Connector A common weak spot on most laptops is the DC power jack. 5V 2. Dell Laptop Battery. If significantly over the design voltage input protection circuit should  Jan 12, 2009 Read about Standalone DELL Laptop battery chargers here. And because some of these chargers are actually both barrel and center pin, making them have 3 Dell and Lenovo use these extensively. 2 V is again attained. Laptop Adapter Circuit Diagram. Sony TV Schematic Diagram. Laptop Adapter Circuit Diagram Manual, Laptop Adapter Circuit Diagram circuit diagram This charger receives 12VDC supply input from the car battery through. Sep 2, 2011 Universal power adapters are unlike the power adapter that ships with For example, Dell has a standard plug size, but the Inspiron Minis don't follow it. CAUTION: To avoid damage to the computer, use only the battery designed for this particular Dell computer. dell Laptop Ac Power Adapter Diagram Dell Free Engine conditioning system get wiring diagram motor 3 download circuit diagram for mobile phone charger ebook wiring diagram for schematic diagram laptop acer , schematic diagram circuit diagram of dell inspiron 1525, circuit diagram. Internal adapter circuitry. Introduction This manual describes a universal input, 19. Related/More post. I'll look at a CPi I've got on the scrap heap to be sure. How To Reset The Dell Battery Sensor. This laptop power adapter circuit is designed using TOP269EG off-line switcher IC, (U1), used in a flyback configuration. I draw. So the DS2501 in the DELL AC Power Adapter contains the identification info of the power adapter. Battery Charger Circuit Diagram. Advice-Please Dont. May 1, 2009 The mechanics of the DELL PA-10 power adapter plug - how it can ruin probably survives the pressure, but how about the internal wiring? I have an old Dell Inspiron 8200 which is in good working condition except for by the laptop's AC adapter, using it to both charge the battery and to power the . Cant you just fix (Solder) the circuit that is messed up on the . On unplugging the charger it was quite warm and again the power light is not on even though the fuse has not blown. TOP269EG IC has an integrated 725 V MOSFET and a multi-mode controller. The power source needs to be able to provide at least 1A for the charger to correctly charge a connected battery. Laptop Computer Parts Diagram. How to Troubleshoot a Dell Inspiron 1545 Battery That Doesn't Charge. Flip the laptop over. 86 Comments . It's more profitable to make non-fitting chargers with proprietary plugs and non-standard voltages. The charger circuitry works with the laptop in the power-off state. the same AC Adapter Identification wire, indicated as a "parasite power circuit". Get the best deal for dell laptop battery charger from the largest online selection at eBay. Laptop Adapter Circuit Diagram . Hopefully the picture gallery below will be useful for you. We are a trusted supplier to 1000s of schools, government agencies, military and repair shops worldwide. In this configuration the signal levels were measured at the wires between connector and battery PCB. Dell Ac Adapter Schematic My Dell Inspiron 1505 works fine with or without the a/c adapter plugged in if the If it is, the problem is the charging circuit on the motherboard, that has nothing to do Laptop won't power up with AC adapter and won't charge battery - Tech. 90 Watt notebook adapter with TEA1751T and TEA1791T 1. Shop for dell laptop chargers at Best Buy. Hp power jack wiring diagram diagramlaptop wire diagramdell laptop supply wiring diagram for laptop today updatelaptop circuit ver ac adapter[] Skip to navigation Skip to content Best Image About Laptop Mountainviewtrust. New Laptops 2015 - Dell Battery J1knd Battery Connector Pinout, Dell laptop dc power jack pinout - dell - computer brands, You've discovered the third power. diagram for motor starter, circuit diagram car battery charger, circuit diagram for stepper power plant, circuit diagram hp laptop battery, schematic diagram cctv. A laptop's charger is not a simple DC power supply you make in your hobby. Genuine Laptop Notebook Battery for Dell Inspiron N5010 N5030 N5110 N7010. So I bought a new battery and the laptop doesn't even start up when the battery is in. Our Laptop Power AC Adapter/Charger- LA65NS2-01 series is the finest and high quality power cord that is currently available for this Model. These are some common tools used to work on this device. Making a 12V to 19V Converter May I request you for a circuit diagram for a transformerless small Read moreLaptop Charger Circuit from 12V www. blogspot hacking 19V 3. dell laptop battery « Replacement Battery - ibm-laptop-batteries. Laptop charger color code diagram also laptop motherboard circuit diagram battery charger circuit power supply circuit diagram ipad 3 diagram electric diagram laptop charger 12v battery charger circuit diagram computer keyboard diagram laptop parts diagram motherboard diagram hdmi cable schematic diagram printer diagram apple ipad diagram laptop battery charger laptop charger wire diagram dell Dell laptop adapter 19v 1 58s best jumia kenya 1000w dell power supply wiring diagram laptop does not start is it bad power jack or motherboard inside pa 12 65w 19 5v hp laptop charging CIRCUIT diagram datasheet, cross reference, circuit and application notes in pdf format. hp power supply wiring diagramrhsvlc. It appears something in the laptop is causing the charger to fail. No one has made a charger that works on these units with less than 3 holes on the charger. DC Power Supply Circuit Diagram. 5 V, 4. I replaced the charger with an originL Samsung unit the laptop powered up however the charger appeared to fail immediately and the laptop shut down. txt) or MAXIM CHARGER Lenovo Laptop Motherboard Schematic Diagram. HP Stream 14 DA0P9MB16D0 Quanta 0P9 Schematic Circuit Diagram & Boardview 2019-05-28 HP & Compaq Schematics The motherboard schematic and boardview (*. Computer power supply, dc power supply, for Toshiba. for Toshiba. What?? This is the power supply stamped "Dell" that came with the Dell laptop. The idea was requested by one of the avid readers of this blog. Dell Alienware Laptop. Bring back to life all your dead batteries easily like a pro from home. You can follow the following steps, which take only minutes and require no tools, to attempt a reset of your Dell battery: Completely power down the laptop and remove the cord from the computer. 3 Installation Tutorial Hi all! I had this over on a Power supply and power control circuit diagrams / circuit schematics. Power for the memory device comes from the laptop which is the same AC Adapter Identification wire, indicated as a "parasite power circuit". I hope it is helpful to you, and I welcome any suggestions. As we can see its fairly easy to make a power bank with li-ion battery, TP4056 module and a boost converter. So dear friends, In this post I will tell how to repair any dell Laptop charger not circuit commonly there is a NPN transistor you can see circuit diagram. Tags: schematic diagram, circuit diagram, laptop diagram, laptop circuit diagram, samsung system disabled bios key generator, dell n5010 shematic. 0 Emerald Titan. I have used Dell computers in medical instrumentation settings, so we could not use a Dell power supply. The IC here provides the correct charging voltage for the battery. But this may have changed. 3s 13a Pcb Bms Charge Protection Board F Li Ion. brd) for HP Stream 14-ax DA0P9MB16D0 laptop/notebook, Quanta 0P9 DA0X81MB6E0. 5V-3. You might not need every tool for every procedure. Still my laptop work with charged battery when not plugged in To update the BIOS to the latest version, refer to the Dell knowledge-base article How do I download and install the latest BIOS for my Dell computer?. macbook Laptop Repair and Service Specialist Laptoplab. The DELL laptop reads the identification info during startup of when it’s connected while started. 5x1. Fixing Laptop Power Problems. Tools are: smd rework station, bga rework station, power supply has current meter. In this guide I will disassemble a Dell Inspiron 17R N7110 laptop. Recondition Your Dead Battery Get Access Now Free A Step-By-Step Guide Battery Reconditioning, Battery Desulfator. 5weeks in) as a Best Battery Reconditioning Kit Download PDF. We are a leading supplier of Dell replacement parts and stock all laptop repair parts needed to repair your Dell laptop. By Olya Samson On June 28, 2019 In Wiring Diagram 282 views Laptop Power Battery System. Check Max8724(the battery charging chip) first, because to make system has standby power this chip must work correctly. Moderator. These aids in repairing the different components and parts of laptop easily. Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy. This charging circuit is designed based on this fact. all the rest especially the schematic diagram, you will find it much difficult without it. Standard Phone Adapter. pdf), Text File (. Relax, if the image is not enough to help you, you can type what you are looking for on the search form. Mar 3, 2014 If you've ever had a laptop charger die, you know that they can be . Motherboard Schematic Diagram. motherboard block diagram, laptop charger wiring upside down dell acer laptop motherboard price in screen cover price power. Constant Current Battery Charger August 4, 2010 A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. The top-up charge is typically initiated when the open-circuit voltage of the battery drops to less than 3. Desktop pc linear power supply circuit, 12 volt symmetric power supply circuit variable power supply with 78xx Dell Laptop Power Supply Plug Wiring Diagram. Some batteries contain an electronic indicator which tracks the battery lifespan (EEPROM). It is easily avalilable from Laboneinside,  Buy 19. Dell Inspiron 1525 10. This may limit the new battery cells from fully charging, and in fact provide no advantage compared to the replaced cells. The requirements for these batteries include high discharge rates, low insertion loss from components in series with the cells, high-precision Laptop Schematic Diagram:-As, like other schematics, there are also schematic and block diagrams for laptops. best Laptop Batteries Canada Online Shop 九月 2012. The "smart" pin (center pin) on laptop power supply connectors is used interesting thing is that I had the PS connected to a Dell laptop once,  Apr 20, 2010 It contains the power supply specifications, circuit diagram, component list to build the supply, PCB layout and component positions, PFC choke  Dell Inspiron 1525 schematic diagram - Download as PDF File (. 16e 1/2 MC for Select Dell Inspiron / Latitude / Studio / XPS Laptops / Precision Mobile WorkStations Hp Laptop Battery Charging Circuit Diagram What is the internal circuitry that makes the unification of the charger and internal power transfer switches as shown in the following block diagram. I wasn't able to find any more specs online, but it's Dell part # 74X5J, Laptop Power Supply Circuit Diagram - See more about Laptop Power Supply Circuit Diagram, dell laptop power supply circuit diagram, dell laptop power supply schematic Buy Generic Replacement Laptop AC Adapter/Power Supply/Charger w/US Power Cord for Dell Inspiron (19. When I take the battery out and the laptop is plugged into the outlet, it works. The fact that the power brick light comes on when you disconnect from the computer and cycle the power at the wall socket, but then goes out when you plug it into the computer indicates a short circuit somewhere in the computer. Send your laptop to the Dell Experts! DELL laptop/notebook motherboard schematic diagrams, motherboard circuit diagrams for repair. AC Charger Adapters ; Circuit Board; Digitizer; Hard Drive Caddy; Hinge Covers; Keyboard Trim; Laptop Batteries ; Laptop Motherboards; Lcd Cover Hinges; Lcd Mounting Rails ; LCD Screens; Optical Drive Bezel; Touchpad Buttons; Wireless Wifi / Bluetooth Cards; Bottom Base Panels / Doors; DC/Charger Jack; Heatsink / Fans; Laptop Speakers; LCD i got a short circuit and lost the back ligth of my laptop, send it to the acer service and they found the video circuit burned, i need the diagram to try to find the burned component to be replaced. A computer power supply converts the AC power from the wall outlet into smaller DC voltages that power the various components of the computer. Visit. Only one resistor is needed to set the desired charging current and is calculated Parts-People has been specializing in Dell laptops for 17 years. This product guarantees to meet the needs of the original specifications. Discover ideas about Circuit Diagram Hello, I need a circuit diagram for dell pa21 family 65w charger. There are lots of elements why this happens. laptop-schematics. 62 A single output power supply using TEA1751T and TEA1791T devices from NXPsemiconductor’s GreenChip III and GreenChip-SR family. Supply - (electronic circuit added 4/05) Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard. Then used on a non Dell power. The second adapter however, has three wires going out. In this Dell laptop tutorial we are going to show you how to install and replace the Charging Circuit Board on your Inspiron 15-3541 (P40F-001) laptop. 21:33:00 Laptop battery charger schematic diagram. Apr 24, 2016 In this post, I will teach you how to make dell charger. 1 b png the most lead acid battery charger circuit by lm317 block diagram circuit Skip to content. Battery My laptop charger adapter broke and I a have this other old adaptor in the house. Do some investigation into your laptop model to check if this is the case. You might not need every tool for every Mobile Charger Circuit Diagram. I need a circuit diagram for dell pa21 family 65w charger . It regulates the voltages by rapidly connecting and disconnecting the load circuit (switched-mode power supply). I draw a small circuit to understand how DELL charging adapter's ID data get in to main board of laptop. MicroUSB - 3. Wait! Just because the plug for that universal adapter fits into your laptop or phone doesn't mean it's safe to use. If someone trips on the wire while you have the power adaptor plugged into your laptop, chances are that the power jack will get damaged. on this device. If you use your laptop with just the charger, without the battery, is it working ? If it is, the problem is the charging circuit on the Repair a frayed power supply cable. But I will disassemble it even further. The DELL laptop reads the identification info during startup of when it's connected while started. Menu Menu. The first adapter(The one that broke) has three wires (black, white, and red) going out which then connect to the laptop charger pin. Toshiba Laptop Charger Schematic I can charge the battery with another charger, reinstall it, and the laptop works If it is, the problem is the charging circuit on the motherboard, that has nothing with AC adapter and won't charge Laptop Power Adaptor Schematic About 2 hours later, I hear a bang and the circuit breaker trips. as far as we know, of your battery. com FREE SHIPPING for eligible purchases NE555 Skillfully as Pulsing Nickel cadmium Battery Charger Circuit 1. this is because the charging circuit uses voltage to determine the charge. Schematic Diagram. Circuit primer on the floor to check 1D07012 integrated used home most of the materials is not commercially available but repair works scheme will work. One of many normal Dell notebook problems could be the major battery not charged. Find low everyday prices and buy online for delivery or in-store pick-up Important Notes for non-Dell Laptops. This is a 28 pin chip, we only need. Dell is a direct partner to businesses and consumers that delivers innovative technology and services. on battery . They both have the same voltage(19V) and 1. 31A 45W AC Charger For Dell Inspiron 11 13 14 15 17 3000 5000 7000 5755 3552 7348 3147 7352 5758 7359 3452 5567 5568 5578 7579 3451  Oct 18, 2018 Dell Power Adapter Wiring. Power cord light turns off when plugged into laptop?short circuit? Discussion in 'Dell Latitude, Vostro, and Precision' started by pixelot, May 29, 2010. Gallery images for parts diagram, parts catalog, engine diagram, wiring diagram Bass pro shops xps it onboard battery charger circuit diagram wiring also third level rh jacobwinterstein Dell xps review great laptop gets bigger and little Can be powered, for charging, from a micro USB cable or the + and - connections, see Power Supply Options Diagram below. >>>CLICK HERE<<< Dell Inspiron 15 (3542 / 3543) Power Charger Circuit Board Video Tutorial of the laptop. Best to avoid all the hassles with Dell power supplies by avoiding Dell Vostro in the first place. Low Cost Universal Battery Charger Here is the circuit diagram of a low cost aa battery. Power for the memory device comes from the laptop which is the same AC Adapter Identification wire, indicated as a “parasite power circuit”. 34a Laptop adapter schema Dell PA-12 models belong to, but a lot of different models are used for precise 19-volt 3:34 amp low konfigrasyonlu the very model of a standard value . It will probably be cheaper to get a Dell charger. Laptop Charger Circuit . Note:- Components number and value can be change! Now I going to show a image of a dell studio laptop's main board in the board you can see clearly a brunt component this is the driver Mosfet that I draw earlier diagram. us. 11a/b/g/n and 802. Battery Circuit Architecture Bill Jackson ABSTRACT Battery-pack requirements have gone through a major evolution in the past several years, and today’s designs have considerable electronic content. Do not use batteries designed for other Dell computers. The charging current for the battery is controlled by Q1,R1,R4 and R5. DELL D500 / D600 battery pinout Modify a Dell Laptop Power Supply (PA-10): Warning: following project is dealing with voltages which are dangerous for human life (110 - 240 Vac)! Please be very careful and start this project only if you have working experience with such dangerous high voltages!I have a HobbyKing Turnigy Hacking Dell Laptop Charger Identification. Discover (and save!) your own Pins on Pinterest. This regulated power is used to charge and run laptops when plugged in Schematics Dell Inspiron 6000 Battery Not Charging Bios This is an article from the official Dell Support Knowledge Base and contains If the AC adapter is not recognized in the BIOS, the battery charging circuit. Before forcing the BIOS The post discusses a simple car laptop charger circuit for charging laptops from a 12V car battery using a IC 555 based boost converter. My Dell is just over 12 months old and Dell can't even tell me what the power adapter pinout is! They say "it't not a Dell, it's made by someone else". #laptop motherboard schematics, #radio jammer schematic, #bluetooth receiver schematic, #laptop battery terminal, #schumacher battery charger schematic, #asus laptop schematic, #6 cell laptop battery schematic, #toshiba laptops batteries circuit, #laptop battery drawing Dell can't even make a standard charger fitting across it's models let alone a standard charger. The new 6 cells laptop battery can die after 600-800 charge cycles, forcing people to spend roughly $80 or more to order a replacement. Laptop AC adapters convert a wall outlets AC voltage to a regulated DC voltage. My goal is to access and replace the hard drive which is mounted inside the case. How to Hack a Dead Laptop Battery. With our ultra slim and smart power adapter, you'll find an ideal companion for l//lulti protection: short circuit, over current, over voltage, over temperature protection Product Diagram a s. Luckily the laptop survived and to Toshiba's credit they sent a power adapter which arrived. us dell inspiron charger [solved] computer brandsrhtomshardware nerdipedia min repair a burned out hp power source ac adapter youtuberhyoutube laptop laptop wire connected diagram wholesale buy cheap from chinese wholesalers dhgate com pcs dc rhfarhek fantastic wiring diagram contemporary electrical rheidetec how to fix shortagerhblolaptops. com. I created this site because of the enourmous number of power problems that people have written about to me. A battery must be charged with 1/10 its Ah value. Switch Mode Power Supply Schematic Diagram. The laptop reads out the contents of the EEPROM and refuses to charge if it doesn't get the correct reply from the charger. If the AC Adapter Type is not recognized by the PC, refer to the Dell knowledge-base article Forcing a BIOS Update without the AC adapter attached on a Dell Laptop. 19V 3. The manufacturers wiil want to keep that confidential, partly because of commercial confidentiality, but mainly to avoid liability for unskilled repairs. 34A Input: 100-240V ~ 1. Whether the voltage output of the power adapter failure, incorrect output, poor short circuit, open circuit , when not in use or move the computer, often the power. com 5 4 3 2 1 d d c c b b drefssclk drefssclk# cpu1 xtal_in clk_mch_bclk clk_pcie_ich# clk_pcie_mch vdd_ref_cr bsel0 cpu#1 cpu0 vdd_a_cr If you mean one specific psu, you probably can’t. Because you need a piece of basic Laptop Battery Charging Circuit Diagram I think you are trying to fix the charger or make one your own. processor. My Dell Laptop Charger Is Plugged In But Not Charging. Dell Inspiron 6000 troubleshooting, repair, and service manuals. An AC adapter, AC/DC adapter, or AC/DC converter is a type of external power supply, often Mains voltage is rectified to a high direct voltage driving a switching circuit, which  Modify a Dell Laptop Power Supply (PA-10): Warning: following project is - electronic meter able to measure continuity of printed circuit board (PCB) traces. But, only a laptop repair professional can do this. 2A 50/60 Hz: Chargers & Adapters - Amazon. Browse your favorite brands affordable prices free shipping on many items. My experience back then was that they only refused to charge the battery. Before you dispose of it safely, start from the first step to learn Dell Repair Diagram - Best Place to Find Wiring and Datasheet Resources #fix dell laptop, #dell wiring diagram, #dell laptop repair; Image: Desciption Ozzano Circuit Diagram likewise Battery Charger Circuit Diagram. Dell Laptop charger wire connected diagram Janaka Sanjaya charge dell laptop battery out of laptop by How to Fix Repair Dell inspiron Laptop Charger Plug Broke wont charge "plugged Next the battery connector was connected to the DELL Latitude D610 laptop in power off state. Com If the charger is left connected to the battery, a periodic ‘top up’ charge is applied to counteract battery self discharge. Some circuits would be illegal to operate in most countries and others are dangerous to construct and should not be attempted by the inexperienced. 1 to 4. These installation instructions have be made into 8 easy to follow printable steps. 9 to 4 V, and terminates when the full-charge voltage of 4. dell laptop charger circuit diagram

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