Mains Detector

This device detects mains and has tested more reliable than commercial models.

NOTE:If this device fails and you are hurt, i will take no responsibility. Test the device before use.

That said, this is what you need:

1)5 npn transistors
2)wire
3)9v & clip
4)speaker
5)switch

The circuit is simple.
Wire up using the picture below.

You are done.

To use it put the antena by the mains you will hear a buzzing sound from the speaker if they are live.
It should sound like this: