<p>Mouser was out of 595-TLC556CN, so I substituted a 595-TCL556IN.  The major differences are that the CN operates on a minimum of 2v and has an operating temp from 0c to 70c and the IN operates on 3v and has an operating temp from -40c to 85c.  From looking at the circuit, I don't *think* the 2v vs. 3v minimum operating voltage will make a difference.  Opinions?
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