LED has become more and more popular for use as light indicator because of its low cost and long life. ... LED at 220V Circuit. October 16, 2013 by P. Marian Comments 22. ... You can use a LED at 220V ...

This is a simple blinking led circuit powered from 220V that can be used to mark special places or as voltage indicator. The voltage from the mains charges the capacitor through R1 resistor and D1 ...

Many equipment manufacturers prefer protection circuits combining resettable overcurrent protection devices with upstream fail-safe protection. In this example, R1 represents a ballast resistor used ...