Hmmm... make two free-running oscillators with the same parts, and hook two LEDS up between the outputs (one red, one green, in opposite directions) so the LEDs indicate phase. Or have one clock the D-FF, and the other provide the D input, use the Q and ~Q outputs to indicate phase.
By showing phase instead of actual clocking, we avoid the need to have <60Hz frequencies. The LEDs would show the beat between them due to component tolerances, not the actual clocks.
Now THAT is a fun idea!
-Dave
-- Dave McGuire Cape Coral, FL
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