Oscillator circuit for a validator
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United States of America Patent
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Apr 29, 2003
Grant Date -
N/A
app pub date -
Apr 2, 2001
filing date -
Aug 14, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coin validator tests a coin using a pair of coils coupled in an oscillator circuit which is arranged to drive both the coils concurrently at two separate frequencies without interference therebetween, each frequency signal being influenced by the presence of a coin. Preferably, the coils are connected in series in a feedback loop to form a first oscillator, and the second oscillator is coupled to the interconnection between the coils the other ends of which are effectively short circuited at the frequency of the second oscillator.
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