Check-actuated control mechanisms – Including means to test validity of check – By testing material composition
Patent
1988-02-29
1989-07-11
Bartuska, F. J.
Check-actuated control mechanisms
Including means to test validity of check
By testing material composition
G07D 508
Patent
active
048463329
ABSTRACT:
A counterfeit coin detector circuit comprising an constant frequency and voltage maxima and minima square wave oscillator input to a tank circuit including an inductive probe and an adjustable capacitance. The tank circuit is driven at a fixed and stable frequency and has a variable peak to peak AC output voltage amplitude which is a function of the characteristics of the coin under test. The AC output of the tank circuit is converted to a DC voltage correlated to the peak to peak AC ouput from the tank circuit. A group of window detector circuits are employed to determine whether the DC voltage output falls within certain preset ranges corresponding to the presence of particular coins. The presence or absence of a window detect can be used to accept or reject the coin or to otherwise take appropriate action with respect to the coin under test. The circuit is capable of being retrofitted into standard toll booth coin collecting systems and provides a simple and very rugged circuit for detecting counterfeit coins or slugs which is also very temperature stable.
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Automatic Toll Systems, Inc.
Bartuska F. J.
Robinson, Jr. Lee C.
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