Hey, your videos are cool, specially the homelab one. I like what you are doing here I don't really know what you are doing! Can you make a little longer explainer video on what you are doing?
Impressive the auto-router's spaghetti traces worked, I've never had good success unless I spend the time to correctly label and prioritize the nets in the schematic so the auto-router doesn't go prioritizing some measly LED status trace and put 50 vias in the ground trace. Yet again I've never just gotten a purely auto-routed PCB manufactured, never trusted it, and even if it did work it would never pass EMC. But I do wonder if a large amount of the overshoot in your situation is actually attributable to your probing technique, the output of that 10 MHz clock should look much cleaner than that? (I assume you only have a clock divider using the 10 MHz) Does the clock signal look much better when you use the ground spring on the oscilloscope probe?
Oh yes, I meant to mention that.. Those probe grounds were running along a small wire clipped on the other side of the PCB, so almost the worst way to do it! The Autorouting is interesting.. with a 2 layer board it is indeed pretty unreliable in how some things get routed, but with a 4 or 6 layer I have found it works pretty well - given some constraints. I just did a 4 layer PCB that I autorouted about 80% of the traces on (>3000 pins), and with a dedicated ground and power plane most of the routes were pretty good. I did all of the clock by hand, as well as some of the DRAM traces, but in the end it worked great. It is certainly not something to be used for a production PCB, but for a hobby it really makes it quick!
Yes, that was somewhat by choice. I wanted to see how well it would work with zero routing effort and 2 layers,, and while there was of course a lot of noise, it still worked great. Indeed in college we did not use autoroute.. of course that is as much because autoroute wasn't much of a think back then. ;)
Hey, your videos are cool, specially the homelab one. I like what you are doing here I don't really know what you are doing! Can you make a little longer explainer video on what you are doing?
it's a simple cpu board, probably just for him to have fun and test around.
Impressive the auto-router's spaghetti traces worked, I've never had good success unless I spend the time to correctly label and prioritize the nets in the schematic so the auto-router doesn't go prioritizing some measly LED status trace and put 50 vias in the ground trace. Yet again I've never just gotten a purely auto-routed PCB manufactured, never trusted it, and even if it did work it would never pass EMC.
But I do wonder if a large amount of the overshoot in your situation is actually attributable to your probing technique, the output of that 10 MHz clock should look much cleaner than that? (I assume you only have a clock divider using the 10 MHz) Does the clock signal look much better when you use the ground spring on the oscilloscope probe?
Oh yes, I meant to mention that.. Those probe grounds were running along a small wire clipped on the other side of the PCB, so almost the worst way to do it!
The Autorouting is interesting.. with a 2 layer board it is indeed pretty unreliable in how some things get routed, but with a 4 or 6 layer I have found it works pretty well - given some constraints. I just did a 4 layer PCB that I autorouted about 80% of the traces on (>3000 pins), and with a dedicated ground and power plane most of the routes were pretty good. I did all of the clock by hand, as well as some of the DRAM traces, but in the end it worked great.
It is certainly not something to be used for a production PCB, but for a hobby it really makes it quick!
your noise is terrible!!! @ 5v scale, your clock looks horrendous. I'm surprised you never got yelled by your teacher never to use "auto route button"
Yes, that was somewhat by choice. I wanted to see how well it would work with zero routing effort and 2 layers,, and while there was of course a lot of noise, it still worked great.
Indeed in college we did not use autoroute.. of course that is as much because autoroute wasn't much of a think back then. ;)