This can be achieved in simple three steps.
Power supply 220v to 12v.
Firstly 220v ac is converted into 12v ac by using simple step down 220v 12v transformer.
Secondly output of this transformer is given to the rectifier circuit which will convert the ac supply into dc supply.
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Low voltage dc like 5v 6v 9v 12v is used in electronics circuits led bulbs toys and many household electronics items generally batteries are used to power them but they need to be replaced time to time which is not cost effective and also takes our time energy.
Generating low voltage dc from the 220v or 110v ac mains is very useful and necessary in the field of electronics.
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