Generally we have seen that there are all indicators in our house on the wall switch board are of neon bulb which is small in size and connects with 68k resistor in series. You can make an indicator that glows very nice and looking so cool using LED and make LED indicator for mains. LED indicator has more lasting than other . Here I am describing the LED Indicator circuit that can be used with For 230v - 240v AC Mains.
LED indicator has advantage of this is available at various color range, no any extra covering glass is needed to change the color and protection. If you need to use bi color or tricolor LED (two or three color) , then no any external circuit needed because led has in built with these property. It has more lasting than other .
LED light glow more bright and more looking beautiful than neon bulb . But There is a problem with led is to this works only with DC power, not with AC. If i connects it with AC power with resistor . We see that LED has negilible glowing.
If we connect a rectifier after the resistor with the anode point of led and ground directly with cathode then proper and sufficient brightness produce as indicator.
A 68kΩ or 100kΩ resistor is directly connected to Ac line(+) terminal to reduce the signal suitable for LED, after Resistor a rectifier diode must be connected in series with resistor to make AC signal into dc and then it connects to LED positive terminal. Negative pin of LED directly connected with AC ground. If you want to make more light glowing of LED then a 50KΩ resistor is connected at the place of 100kΩ resistor . .
Please careful with when connecting the terminal of diode and led. If connecting with wrong way or opposite then indicator will not work. Use 1N4007 diode. Following is the connection diagram of LED indicator with 230v AC.