<div>Hmmm... I'm scratching my head on this one.</div>
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<div>The VCO I just built (EN/CGS/Blacet/etc. style) is working great. But...the sync input behavior is mysterious to me. It syncs fine to a master rising ramp (no surprise) but it won't sync to a master pulse or square...unless I invert them first. Since the square is either +5v or -5v, why does inverting it make any difference?
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<div>peng</div>