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Indicator LED directly to AC mains. Which method would you use? - Electrical Engineering Stack Exchange
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Simple 220V Mains Indicator LED
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Simple and Useful LED circuits
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Battery Level Indicator Circuit using LM3914
LED Power Indicator Circuit For 230v - 240v AC Mains
switches - How to connect an LED indicator to a circuit? - Electrical Engineering Stack Exchange
LED Indicator For AC Mains 240 Volts | How To Connect LED To 230 Volts - YouTube
Indicator LED directly to AC mains. Which method would you use? - Electrical Engineering Stack Exchange
Many Simple LED AC mains voltage & current indicator circuits
power supply - Add on/off indicator LED to circuit - Electrical Engineering Stack Exchange
