On Thu, 16 Nov 2006 10:21:40 -0500, "Wombat-Pipex-News"
wrote:

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Press 3 and C lights, AB off, don't you mean?
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Yaa. :-)

I presume on the diagram that the chips are already supplied by +5V to both
pin14s and GND on Pins 7.

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Yes.
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Also on the second 74HC02 does the UC2 UCD pins 10 13 need grounding via a
resistor?

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No.
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As the outputs would be High until the button was pressed.

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The outputs of U2C and U2D will _always_ be high, regardless of
whether S3 is made or not, since their inputs are wired to ground.

Notice that R5 is used to pull U2-5 down to 0V when S3 is open.
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Or can I just leave them unconnected.?

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Yes. They're outputs, so there's nothing critical about them.


--
JF