[sakis1]

Originally Posted by gold24h

the old guy said to use a selenoid coil from an old automatic washing machine,they are on the water valve controle on the back of washing machines,the amp is about the size of your hand,it has a speaker in it,you get them at radio shack,the sensor can be bought on the internet,it is called cell sensor,it is a combination electromagnetic and cell phone radiation detecter,he said the coin will have a drastic change on the cell sensor meter,it suppose to have about a 50 feet range,you check west to east first,get a signal,then south to north,my brother built it but could not understand how to calibrate it and use it,the sensor has a sensitivity controle,a high and low switch.

magnetometer!!!! ?????