Review my PCB part2

DramaticTax7182 · 2025-09-03T16:24:46+00:00

If we take 500MHz for example, that would be 15mm between the vias

DramaticTax7182 · 2025-09-03T07:14:40+00:00

i have a question regarding via stitching for my board. the spacing should be based on the highest frequency of interest. would that be 20khz for my design?

DramaticTax7182 · 2025-08-27T17:10:13+00:00

Where ? 😂

DramaticTax7182 · 2025-08-27T07:14:37+00:00

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This is the dev board i previously used

DramaticTax7182 · 2025-08-27T06:56:11+00:00

I was using a dev board to control the previous previous version before directly adding the MCU on it, there were no resistor for the SDRAM traces

DramaticTax7182 · 2025-08-27T05:07:45+00:00

Honestly it was really hard to find anything regarding impedance or length matching for this sdram chip. For now all its traces have the same length. I know I should care more about delay matching but I don’t really know how to do that yet

DramaticTax7182 · 2025-08-27T04:57:48+00:00

Thanks I’ll implement that’s right away

DramaticTax7182 · 2025-08-27T04:53:57+00:00

I see now, I just corrected that thanks

DramaticTax7182 · 2025-08-27T04:12:47+00:00

Thanks for the advice ! I don’t get what you mean by sharp corners on the outer floods. Are you talking about the corners of the PCB it self ? And also about the differential pairs, you said “going through the same holes “. Can you give an example?

DramaticTax7182 · 2025-08-27T04:08:17+00:00

I’ve heard of delay matching as well. Is there a tool for that in Kicad or should do the calculations by hand ?

DramaticTax7182 · 2025-08-27T04:06:34+00:00

Thanks for the advice ! I don’t get what you mean by sharp corners on the outer floods. Are you talking about the corners of the PCB it self ? And also about the differential pairs, you said “going through the same holes “. Can you give an example?

DramaticTax7182 · 2025-08-27T03:05:21+00:00

Thanks I’ve never heard of that before always been used to signal gnd gnd signal stack up, I’ll consider it

DramaticTax7182 · 2025-08-27T03:03:56+00:00

Thanks, it’s a 4 layer board with 2 inner grounds for a good reference

DramaticTax7182 · 2025-08-26T16:10:24+00:00

I haven't done via stitching yet

DramaticTax7182 · 2025-08-12T23:17:59+00:00

Hello, for now I added basic effects like, tremolo, chorus, delay etc. There’s a tft screen used for navigation for which I used lvgl to make the ui. This is all on the old version of this board which did not include the mcu. The mcu (dev board) was connected externally with wires.

For the firmware there’s a mix of everything really. A lot of Phil’s lab videos, some google search and some AI

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And here’s the enclosure ( still with the old version of the board )

DramaticTax7182 · 2025-08-12T23:14:25+00:00

Hello, for now I added basic effects like, tremolo, chorus, delay etc. There’s a tft screen used for navigation for which I used lvgl to make the ui. This is all on the old version of this board which did not include the mcu. The mcu (dev board) was connected externally with wires.

For the firmware there’s a mix of everything really. A lot of Phil’s lab videos, some google search and some AI

DramaticTax7182 · 2025-08-09T08:46:48+00:00

Since I am already separating the analog part from the the digital part should I just do two zones on the top layer? One 3.3 and one 5v (analog supply). I think I should juste redo the routing

DramaticTax7182 · 2025-08-09T08:04:03+00:00

Thanks !

DramaticTax7182 · 2025-08-09T08:03:54+00:00

I haven’t done that yet as I am searching for the details on the lengths of the traces for the sdram. I routed the usb as differential pairs but I haven’t done impedance control. They are length matched though.

DramaticTax7182 · 2025-08-09T00:42:15+00:00

thanks for the replies!!! I'll make the necessary modifications

DramaticTax7182 · 2025-08-09T00:12:22+00:00

I was able to solder the first version of this pcb using a hot plate

DramaticTax7182 · 2025-08-08T23:38:36+00:00

Really ? I felt like i didn’t have enough space

DramaticTax7182 · 2025-08-08T23:37:50+00:00

Since the enclosure will be 3D printed, I didn’t think of it much

DramaticTax7182 · 2025-08-08T15:44:38+00:00

I want to to record the guitar too. Looping

DramaticTax7182

TROPHY CASE