Transformerless Power Supply with adc sensing

Generating Low voltage DC, from the 220v or 110v AC mains, is very useful and necessary in the field of electronics. 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