Coin / Stainless / Metal Detector Project for Security Purpose 9VDC Assembled Electronic Circuit : FA919 This is metal detector circuit board which was already assembled and tested, this board can detect any metal , coin , stainless any thing which was made by the metal, 1-5cm distance for sensor to detect the metal depend on how big of metal, if it is small size, it can detect 1-2cm, example coin. Require Power Supply 9VDC ( 9V battery ) , Current Consumption 40mA operate mode Adjustable the sensitivity to detect by POT , Detection distance 1-5cm depend on size of metal. Buzzer alarm and red LED turn on when sensor can detect the metal. PCB size : 3.01" x 1.71" , All module is tested again before shipping. , Comes with the schematic.