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Woshifeilubinren asked Can a cellphone charger be used as a power supply?
Hello, I want to know if a cellphone charger can be used as a power supply for electronic circuits. I know that the internal circuit of a cellphone charger has a transformer, rectifier, and additional stages for changing AC to DC. I am now requiring a power supply to power up an electronic circuit. I can use a battery, yes, but it is not economical as it may soon exhaust itself. Can a cellphone charger be used? IThanks
And got the following answer:
Most likely yes. If you look at the "brick" at the charger plug, it should list a voltage and current rating - something like "5V 500mA". In this case, the output voltage would be 5V and it is capable of sourcing up to 500mA. Most battery-operated devices use two AA batteries which have a nominal voltage of 3V. So you would need to create a system of stepping down your output voltage to the required input voltage of your new system (resistor voltage divider network is easiest, but not very efficient). Provided you stay within the current limitations of the charger, you should be fine. I created a similar setup to power a small battery-operated clock on my lab bench at work, so yes it can definitely be done - you just need to be careful of your design parameters.