Electronic coin verification mechanism

摘要

An electronic coin verification mechanism includes first and second drive coils driven by complementary sinusoidal signals provided by an oscillator. First and second sense coils are disposed opposite the first and second drive coils and are inductively coupled thereto. A reference coin is removably retained between the first drive coil and first sense coil while a coin under test is guided along a predetermined path which passes between the second drive coil and second sense coil. A comparator coupled to the first and second sense coils compares the voltages inductively coupled thereto and generates an output signal when such inductively coupled voltages substantially equal one another for indicating that the coin under test matches the reference coin. The first and second drive coils and first and second sense coils are each planar and are advantageously provided by forming the same as spiral patterns of metal upon printed circuit boards.