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When you insert a coin into a public phone it generates a tone for each type of coin inserted. therefore cannot be cheated by penies or nickels for quarters. The proper tone feedback tell s the phone co. the correct amount inserted.

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16y ago

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How do you design and build a coin seperating machine?

get several sheets of metal or plastic (depending on how many coins your country has). Then measure each coin in diameter and cut out holes in one sheet of metal/plastic that are smaller than the designated coin but big enough for the next biggest coin to pass through. then repeat for each coin. when you're done with the holes but the sheets in a sturdy box and attach them to the walls of the box about 1 inch appart. Then pour in the coins and shake the box. the coins should be all separated by size.


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