The hottest PCB Design Substack posts right now

And their main takeaways
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Top Technology Topics

I Thought SOT666 Was a Standard - It Isn’t.

atomic14 • 173 implied HN points • 22 Mar 26
đź•ą Technology PCB Design
  1. SOT666 is often assumed to be a standard footprint, but it isn’t — different parts can have different pad sizes and pin spacing.
  2. Manufacturers and vendors interpret SOT666 differently, so using the wrong footprint can cause misalignment, soldering issues, or assembly failures.
  3. Always check the component’s datasheet and recommended land pattern (and, if possible, verify with samples or 3D models) before finalizing a PCB footprint.

ESP32 Rainbow QA - A tale of three boards

atomic14 • 173 implied HN points • 02 Jan 26
đź•ą Technology PCB Design
  1. Minor assembly or soldering faults—like lifted pads, poorly seated ICs, or cold joints—can cause big failures such as no sound, no USB, or nonworking keys.
  2. Simple bench debugging (microscope inspection, continuity checks) plus basic rework (reflowing solder, nudging parts, retouching pins) can fix many issues, though some damaged boards are only fit for spare parts.
  3. Outsourcing PCB fabrication and partial assembly is fine, but final in‑house assembly and thorough QA are essential to catch subtle manufacturing problems before shipping.

Real Roche Chips!

ASeq Newsletter • 21 implied HN points • 25 Feb 26
đź•ą Technology PCB Design
  1. Clear images of Roche SBX chips from AGBT have surfaced and are being shared on Discord.
  2. The photos use colored 'party' lighting and lack a neutral background or scale, which makes careful inspection harder.
  3. A 2.54 mm pitch SIL header visible in the picture is being used as a scale to de-skew the image and estimate PCB dimensions, while fuller measurements and analysis are in a paid subscriber post.

Designing your own PCBs

lcamtuf’s thing • 2652 implied HN points • 09 Mar 23
đź•ą Technology PCB Design
  1. Designing your own PCB allows for faster iteration on new designs compared to ordering custom circuit boards.
  2. KiCad is a recommended tool for designing hobby PCBs due to its extensive library of footprints and open-source nature.
  3. Consider important factors like component placement, trace widths, and manufacturing constraints for successful PCB layout.

Custom KiCad Silk Screen

atomic14 • 173 implied HN points • 27 Jan 25
đź•ą Technology PCB Design
  1. You can easily add custom designs to the silk screen of your PCB in KiCad. It’s a simple process to import images, opening up creative possibilities for your designs.
  2. Remember that KiCad only supports black and white for silk screen designs, so any colors or shades will need to be converted. This can affect how your graphics look when you import them.
  3. To get the best results, it's helpful to turn off anti-aliasing in your graphics software. This way, what you see is what you get in KiCad, making it easier to control the final look.
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Transmission line explorations

Only Wonder Knows • 19 implied HN points • 06 Oct 23
đź•ą Technology PCB Design
  1. When designing for high speeds, it's important to investigate the terrain, understand the influencing factors, and make informed decisions.
  2. For differential transmission lines, attention to impedance match and signal attenuation is crucial for maintaining signal integrity.
  3. Factors like coupling effects, dielectric thickness, solder mask, copper thickness, and material choice all play key roles in high-speed design outcomes.