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'[PICLIST] [EE] Discrete money testing device'
2000\11\16@162804 by Saurabh Sinha

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Hi,

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

Thanks.

Regards,

Saurabh

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2000\11\16@164248 by David VanHorn

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At 11:25 PM 11/16/00 +0200, you wrote:
>Hi,
>
>Need to do a discrete implementation of a money-testing device (bank notes
>and possibly coins), anyone with some experience, for a starting point?

US paper money dosen't flouresce under UV, and has weakly magnetic ink.
Copier toner is much more magnetic.
UV light can be had from a simple spark, add a filter and you have a UV
source.
A photodiode can look for the flourescence.

Coins might not be worth the trouble (unless it's a vending machine or some
such)

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2000\11\18@115425 by dre Domingos F. Souza

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>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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2000\11\19@023442 by Lee Jones

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>> 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 really simple coin mechanisms are totally mechanical.  There
are a sequence of specific sized gates, magnets (to catch steel
"slugs"), and a weighing system (tip balance).  Accepted coins
fall out one way and usually trigger a springy wire attached to
a microswitch (to count the credit).  Rejected coins fall out
another way and drop into the refund chute.

However, I've never seen a bill accepter that wasn't electronic.

                                               Lee Jones

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2000\11\19@120347 by dre Domingos F. Souza

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>The really simple coin mechanisms are totally mechanical.  There
>are a sequence of specific sized gates, magnets (to catch steel
>"slugs"), and a weighing system (tip balance).  Accepted coins
>fall out one way and usually trigger a springy wire attached to
>a microswitch (to count the credit).  Rejected coins fall out
>another way and drop into the refund chute.

       But it's easy to hack. Electronic devices are harder...


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