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Description: To come up against an electric cable while drilling a hole in a wall can have catastrophic consequences. Likewise, drilling into gas, water pipes or central heating pipes can be extremely hazardous. With a handy metal detector it can now be determined beforehand whether there are metal objects to be found in a wall, ceiling or floor. An LED indicates if a metal object is in the vicinity.
If you experience difficulties with the calibration of the unit (ie if the LED doesn't turn off, when there isn't any metal present ), replace C1 with a ceramic 1.2nF (122) capacitor. This behavior is due to a spread on the component values and differences created when winding the coils.
For those wanting an audible signal, space is provided on the print for connecting a buzzer type SV4/12-S.
avoid disasters when drilling holes in walls
locate pipes, cables, metal studs, …
great project for novices
your own unique application
push button operation
metal detecting distance adjustable: up to 8cm (3.15")
power supply: 9V battery (not incl.)
12VDC-buzzer connection (buzzer not included)
dimensions: 56 x 64mm (2.2" x 2.5")
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