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EEVblog #1334 – Mystery Dumpster Teardown

Mystery dumpster teardown time! With the most amazing mechanical mains power switch you’ll ever see! ...


  1. All ‘funny money’ is the same width, so no point in checking it.

  2. Sensors on the sides, do not detect the width of the bill but the presence of fibers in an attempt to “fish” bills from the stack.

  3. Very dangerous PSU !!! Even chinese dont do that

  4. I think the US is the only country that uses bills that look so damn similar to each other – everyone else has gone multicolored to allow for quick determination of denomination (and often size can be used as well).

    Also, the mints have a tough time redesigning bills because they have to now test against various automated bill and coin acceptors and if they don’t work, they need to give the developers time to modify the code to have the bills or coins work.

  5. Dang straight “In God We Trust”

  6. Anyone else notice the shorts on the CPU and PLD? Also how a lot of the board is shoddy hand soldered?

  7. I know nothing about bill accepters, but I did work in the bank check reading industry for 24 years. It is quite possible that the 6 sensors are not just reading points on the bill, but are kept active while the bill is moving and their outputs are compared with a particular waveform produced by the various features of the bill. This is how magnetic and optical character readers work. They don’t just “snapshot” each character, but analyze the waveform produced by the magnetic or optical read head as the check moves past.

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