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220V live wire-in-wall scanner

electronics



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220V live wire-in-wall scanner

description

This little circuit will help you to scan the line of a 220V live wire in the wall. The FET gate is connected to a capacitive metal sensor (which is usually a simple metal plate). When you hold the sensor close to the wall, the LED will indicate the current flow around where it detects the wire. Works on 9VDC.

Schematic diagram



component

value

R1

15M

R2

1.8k

R3

1M

R4

P

10k

D1

1N4148

D2

1N4148

component

value

C1

2.2u

C2

100n

C3

22u

T1

BF244

T2

BC182B

T3

BC182B

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