Digital Section Schematics

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Included in this diagram is a single ADC and the optical isolation.  The single ADC handles five of the ten channels and interfaces a USB chip through the opto-isolators located bottom left.  The opto-isolators also pass control signals and clock signals between the ADC and USB.  The thick red lines indicate power boundaries.  The left is analog power, the middle is digital power and the right is USB power.  This isolation provides the maximun noise immunity through the power system.
 

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