>Need to do a discrete implementation of a money-testing device (bank notes
>and possibly coins), anyone with some experience, for a starting point?

        The simpler/most interesting device i've ever seen is the coin acepptor=
 from game machines (at least in Brazil - but made in taiwan). It has three=
 coils - one recives a pulsetrain and the other two reads the magnetic=
 field generated by the first. Between one of them, there is the reference=
 coin. And the other side is the path where the coin to be recognized pass=
 thru. A comparator triggers a solenoid which accepts or not the coin, and=
 counts or not the credit. It's a very simple and interesting device. The=
 simpler ones use a 4538, 4511 and a 4558. If someone is interested I can=
 post detailed photos of the mechanism.


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        All the best!!!
        Alexandre Souza
        xandinho@interlink.com.br
        Linux User #85093

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