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STEP 6: Add the optocoupler.
If your kit came with a VTL5C4(4 leads): Insert the optocoupler into the PCB so that the
side with the yellow dot is facing up. Orient the optocoupler so that the yellow dot is
pointing towards the positive (+) eyelet. The LED lead that goes in the positive (+)
eyelet highlighted in red, should be slightly longer. The shorter LED lead goes in the
eyelet highlighted in green. Insert one of the element leads into one of the element
eyelets highlighted in purple. Insert the other element lead into the other element eyelet
highlighted in purple. It doesn't matter which element lead goes in which element eyelet,
but obviously you'd want to put them in the eyelets where they would naturally lay
without crossing them or shorting them out against one another.
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