Metal detector for deep searching

Assembled and tested board ATTENTION: This detector is not suitable for beginners. This detector work stable with various coil diameter - from 10 cm to 1x1 m Only 3 potentiometers Low reaction for stones, which consists iron and ferrous oxides You can use it for: - Deep searching (with big coil or frame) - General purpose metal detector - Searching on the beach - Searching meteorites - Searching gold (nugget) Characteristics: Model: NH-173 Principle: Pulse induction Mode: non-motion Search coil: You can buy it from the site. Also you can do it yourself (description in the manual). Sensitivity (with 27 cm coil): 30 cm for small coin, 45 cm for big coin. Indication: sound (speaker not included) Low battery indication Power: 12V Reverse power protection Consumption: ~140 mА Dimensions of PCB: 127 x 91 mm