GaryGru-
Schematics!!!
06/28/2019 at 10:01 • 0 commentsI've uploaded the KiCad schematics and layout files. The connectors changed to a double row pin header half hole combination. The PCB is now breadboard friendly when assembled with pin headers but can still be soldered directly on a PCB as well.
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yummyDSP ESP32 audio lib
06/05/2019 at 08:50 • 0 commentsbtw. I've uploaded the libray I'm yusing to GitHub
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DevKit setup
06/05/2019 at 08:44 • 0 commentsThe codec is running fine in my ESP DevKit test setup. No problems so far even at 192 kHz! Input to output latency is only 2ms!
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PCBs arrived
05/06/2019 at 08:05 • 0 commentsHooray, the OSHPark PCBs arrived. Took some weeks to Germany with free shipping. They are perfectly purple, solder mask and silk screen are looking really good. Knowing that OSHPark does not officially support castellated holes, at least one side is looking ok. The other side is not through-hole plated at all, although the design is fully symmetrical. Nevertheless, should be ok for a prototype (solder blobs to the rescue!)
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Prototype PCB
04/14/2019 at 10:18 • 0 commentsI decided to give OSHPark a try although they don't officially support castellated holes. So for now I'm waiting for the prototype PCB...
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Gerber
04/10/2019 at 21:41 • 0 commentsToday I found the time to finish the design and export the Gerbers in KiCad.
Learnings:
- Gerber export is done via File->Plot in PCBnew
- Solder mask min width had to be set to 0.099 mm to allow 0.1 mm solder mask bridges between the codec pads (found in Setup->Pads to Mask Clearance)
- Looks like castellated holes leads to extra charge due to special milling bits
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PCB layout
04/03/2019 at 21:47 • 0 commentsSchematics and layout are done and yay it fits into 1 square inch! Gerber stuff and production files are next.
