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We use our smartphone every day. But, have you ever wondered how your smartphone charger works? You would know that charger converts AC to DC, but its not that straightforward. First, It converts AC to DC then again back to AC and then finally to DC. Today we are going to see how the charger does this, and why are there intermediate steps. This is a normal charger that converts 220 volts AC to 5 volts DC. Lets see whats inside. Now we can see all theelectronic components used in it. There are diodes, capacitors,transistors and resistor, also there are resistors below the PCB. This is a transformer, and this is an optocoupler. Once power is supplied it turns on. To understand it better lets rearrange the circuit. Now we can see all the components and connections. This red wire is phase wire andthe black is neutral. First we have is a resistor. By observing the color bands and reference table we can see its 260 kilo ohms (2.6 ohm). (Its a golden band and not y