Somewhere in the world a coin is being gravity fed
through three pairs of mutually coupled inductive coils.
If the coin is legal tender it’s highly probable
the core of a linear solenoid will actuate
a spring loaded accept gate with coin on string detectors
positioned above the entry to the separator.
Now the coin will be routed into a coin cassette tube
from where it will someday be designated change.
Where the allotted coin tube has filled to the pre-programmed
limit the coin will be sent down a chute to the cashbox.
The routing and tube limit info is stored in eeprom.
The coin properties are burned to a prom and called windows.
It’s not hard to go from knowing these things for a living
to fearing the eye of a duck with gambling addiction.