four components. Which are a 250nF / 630V capacitor, 1N4004 diode, LED and a 5.1K / 1 watt resistor.
The circuit is not using any power supply, it is directly connected to the mains therefore do not touch it when it is powered or connected with the mains supply. This circuit must be placed in a suitable enclosure.
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Here is a very useful project of a simple 220V mains indicator LED circuit. The circuit can operate a single 3.6V LED directly from 220V AC. It will indicate the presence of AC mains voltage and it can be used with many projects or separately to indicate the present of AC.
The circuit is using only
