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it converts AC line voltage to DC low voltage. at first by transformer it setps-down the voltage then it rectified by bridge rectifier ckt. by this there is rippled DC output is there. then is this fed to filter circuit to filter the ripples and its given to regulator circuit to produce fine and smooth pure DC voltage. nowady SMPS (switch mode power supply) is use rather then older iron core Transformers. SMPS have plenty of advantages over the Linear power adaptor. :))

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Q: How does a power adaptor work?
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