I have built this power supply and clock signal extractor exactly as shown:
I have double-checked this and the rest of the clock multiple times.
However, my clock runs twice as fast as it should (each second, it counts to 2 instead of to 1.)
After spending about 5 hours trying to figure out what I did wrong, I read an unrelated article about half-wave vs. full-wave rectification. I then realized that perhaps the problem is with the instructions.
Given that the bridge rectifier in the supplied diagram is full-wave, wouldn't the clock signal from this diagram actually be 120 hz and not (as labelled) 60 hz?
The specific rectifier used is Jameco part # 103018.
edit: said "unrelated post" mentioned above: http://www.dutchforce.com/~eforum/index.php?s=ce079f0f532f189320af403ffacb6866&showtopic=18061