![]() ![]() The output state is not just 0 or 1 on one pin, but instead it is Q: open, /Q: ground and Q: ground, /Q: open. The logic on these flip flops is slightly different from for example TTL logic chips. Hi Dan, Thanks, nice to hear that you like the project. Here's the result after milling six of them in one go: I only have 160x100 circuit board blanks, so when laying out this board (and all the others in this project), I had to keep the size down and fit as many on a board as I could. I want to thank Fablab Amsterdam for the many hours of machine time. After many revisions, this is the final board I settled on:Īfter lay out the circuit board, I milled the pcbs out of single sided FR-1 stock using a Roland Modela mdx-20. Their size is the main determining factor in the circuit layout of the flip-flops. I ordered the cheapest 5 volts relays I could find off of Ebay. All the 15 flip flops in the clock are exactly the same. I took Simon's schematic, modified it slightly to suit my needs and then made a circuit board layout in KiCad. He does an excellent job at explaining how they work in the following video. As I wrote before, the design of these flip-flops is copied from Simon Winder's design. The Johnson counters in the clock are made by stringing together individual flip-flops. ![]()
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