DEVICE FOR CHECKING THE AUTHENTICITY OF COINS, TOKENS OR OTHER FLAT METAL OBJECTS

摘要

The device proposed includes a channel, with a lower and an upper wall, along which a coin moves, lying on the lower wall, past at least one inductive sensor with a coil (S). The coil (S) is fed with a first current (I1) from a first power or voltage source (19) and with a second current (I2) from a second power or voltage source (21). Between the coil (S) and the first power or voltage source (19) is a capacitative element (C1) connected in such a way that the coil (S) and capacitative element (C1) form an impedance (Z1). The phase difference (1) between the first current (I1) and the voltage across the impedance (Z1) is used as the criterion for acceptance or rejection of the coin.