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…Hi,  When we supply the microcontroller we use  12V step down transformer> rectifier> filter> 5V voltage regulator.


Why not use? 5V transformer> rectifier>filter only.


And what voltage regulator will do in our microcontroller?

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The powering supply voltage to a microcontroller is 5v if you use a 5v transformer if there is loss of power your output voltage will be drop in the rectifier and there will be change in voltage these can be overcome using a regulator it will give a constant output

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