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  1. Nowadays, Lithium batteries are used extensively in portable devices, such as cellphones, laptop computers, electronic gadgets, … etc. There is a standard industry-defined procedure (cycle) for charging the lithium-ion/lithium-polymer batteries, otherwise, the lifetime of the batteries is reduced significantly or even they might explode and catch fire. As a basic rule of thumb, a lithium battery should be charged at the rate of 0.5C to 1C. In this article/video, I have introduced a universal double lithium battery charger that the charging current (C rate) can be adjusted simply by changing a resistor value. You just need a 5V power source (such as a mobile charger) and a USB Type-C cable. To design the schematic and PC, I used Altium Designer 22 and the SamacSys component libraries (Altium Plugin). To get high-quality PCB boards, I sent the Gerbers to PCBWay and purchased original components using componentsearchengine.com. To examine the charging current/voltage, I used the Siglent SDM3045X multimeter. Isn’t cool?!, So let’s get started! References Ref: https://www.pcbway.com/blog/technology/Double_Lithium_Ion_Lithium_Polymer_USB_Type_C_Charger_863d1ae1.html [1]: MCP73831 datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/20001984g.pdf [2]: MCP73831 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/MCP73831T-2DCI%2FOT/Microchip [3]: Electronic designing CAD software plugins: https://www.samacsys.com/library-loader-help [4]: Altium Designer plugin: https://www.samacsys.com/altium-designer-library-instructions [5]: Siglent SDM3045X multimeter: https://siglentna.com/digital-multimeters/sdm3045x-digital-multimeter/ Altium Designer + License (Free): https://www.altium.com/yt/myvanitar
  2. Hello Everyone, I am trying to build a mobile phone charger (For my Samsung phone) by myself using following components. Step down transformer (from 230V to 9V 1200mA) Bridge Rectifier 1000uf capacitor (To smooth the DC voltage) 7805 Regulator (To get output voltage 5V) A micro USB cable I got from a broken charger. Appreciate if you can share your thoughts regarding this. Will this harmful to the phone or will this work better than the low quality Chinese chargers?
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