To come up against an electric cable while drilling a hole in a wall can have catastrophic consequences. Likewise drilling into gas water 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 an audio signal is also desired space has been provided on the PCB for a buzzer ( type like SV4/12S ) to be connected (not included). The PCB has been specially constructed to fit entirely into to the separately available box. Metal detecting distance adjustable: up to 8cm (3.15) Power supply: 9V battery (not incl.) Dimensions: 56 x 64mm (2.2 x 2.5) Troubleshooting Hint: If you experience difficulties with the calibration of the unit (I.E. if the LED doesn't turn off when there isn't any metal present ) replace C1 with a ceramic 1.2nF (122) capacitor. This behaviour is due to a spread on the component values and differences created when winding the coils.
