As shown in this answer, Owen and Beru Lars should be very familiar with C-3PO (he stayed with Shmi Skywalker till her death, and was present at her funeral).

Yet, Lars (not sure if Beru saw him during ANH) never recognizes C-3PO in the first part of A New Hope, despite presumably having lived with him during the time of Shmi Skywalker's marriage to Cliegg Lars. 

Is there a canon explanation for Owen's lack of recognition?

(related: How come Obi-Wan doesn&#39;t remember R2D2 and C3P0 in New Hope? )


Question: Dealing with digital circuits and their associated switching speed?
Answer: The '163 is a synchronous counter (with synchronous reset), so there's absolutely no excuse for trying to use it with a "ripple"-style clock.

Instead, you should have the clock inputs of both counters connected to your clock source, and you should use the "Enable P" and "Enable T" inputs to control when the second counter advances.