Description : …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?
Answer : 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