I created this 2-layer PCB based on the original debugging clock generator designed by Ben Eater. This board can generate a 5v clock signal ranging from <1 second to about 1000 Hz using a dial, as well as single step the clock with a push button.
The output of this circuit is useful when debugging or developing a clocked circuit like a retro PC board. I plan to use this to single step several 8-bit computer boards that I'm working on, including an Apple 1 design. It is a little overkill to use 555 timers for things like debouncing buttons and switches, but very cool to do just for the sake of it.
I used the latest version 9 of KiCad for this board for the first time, which went very well. I'm impressed with the capabilites of this software which is free to use for this purpose. I highly recommend you try it out!
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