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| Shielding
| | #REDIRECT [[Improving Phidgets Hardware Reliability]] |
| * Hard to do right
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| * Emissions hit shield and travel back to ground with resonance
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| Size of circuit
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| * Circuits are always loops, and loops will resonate like antennas at a frequency determined by their size
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| * The smaller the loop, the higher the frequency
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| * Higher frequencies have a smaller potential to interfere with circuit frequencies
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| **Keep hookup wires short
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| Multiple power sources
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| * USB is one source, wall and battery power is another
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| * With only one device, not really a problem
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| * With more than one device, you create a closed loop between the two devices and the power source
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| ** Electrons can return via the grounds connecting both devices and the PC motherboard rather than just straight to wall or battery ground
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| ** Solutions:
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| *** Make the connections between all devices and battery or wall really desirable to electrons
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| **** Low resistance
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| **** Big fat wire
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| **** As short a wire as possible
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| ***Use a USB isolator
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| ***Use Ethernet for data rather than USB (or wireless), only for future Phidgets
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| ==Introduction==
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| This primer will help you
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