This clock is nearly working. I soldered together the latest PCB, and it works pretty well except the seconds wouldn't advance the minutes, and the minutes wouldn't advance the hours. Long story short, I solved this by replacing a few 1n4148 diodes with some 4.3V zener diodes, and added a few small caps. if you build it on your breadboard, I won't say it will be easy but it should work!
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