[sdiy] understanding a common resistor symbol

[Scott Gravenhorst]

The prime symbol comes from mathematics, it usually means that R and R' are related
in some way.  The relationship should be explained in documentation, there is no
set definition.  

Bottom line is that they are just labels.  The prime symbol may help you understand
how the circuit works, but is no use for simply building a circuit from the
diagram, so as someone else suggested, they could be A and B or Horse and Banana.

-- ScottG
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-- Scott Gravenhorst
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