Clock circuit for 8-bit breadboard computer. Now working reliably in free run and single step modes.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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ayes / no?
switch bounce
55 Comments on a 555 Video. I must be on Time.
Great JLBrB Timer Circuit.
👍
God Bless.
is it posibel to make the 555 timer a pico second timer
How are you sir … can you help me. Assemble ic 74ls164
what is the name of the black box ?with the wires coming out
How is this even a challenge, why not build your computer out of 7400s, this is way to easy for you 😀
you could save one resistor by wiring the nc and no of the switch hard to their supply lines, but have the resistor in series with the 'wiper' instead…
Yay! I found another breadboard computer video!
Most switches are break-before-make, which means that when you depress the switch the connection to the common disconnects from the NC pole before connecting to the NO pole. If that didn't happen you would be shorting the NC and NO together which, in your circuit, would short the plus bar to the minus bar. Not good.
On your scope you saw the trace go from +5 to +4 then to ground. I think the duration of the +4 was the flight time of the common contact leaving the NC pole until reaching the NO pole.
Clock?, Countdown?
Ah, I see, "The Final Countdown" – (or Count Up) lol
Hi Julian, love your videos, and great job as always on this one. Do you plan to build the computer on a PCB once the design is final? It would help to clear up any problems with noise and glitches, of course.
Also, an old friend and colleague once described the 555 timer IC as the Swiss Army Knife of electronic design, that circuit is useful for so many things even all these years later.