Bob Larkin
Well-known member
I was trying to evaluate a WM8731 codec and became aware that the Teensy audio library supported this. One thing led to another, and rather than running a board designed for a different system with proto wires, I ended up starting a Kicad board with the same layout as the current SGTL5000 adaptor. This would minimize lead lengths and make a module possible.
This is at the point of putting down traces for the PCB, and I thought I would post this for "design review" comments. It might save a board cycle and also make something more useful to others. The plan is to share this on OSH Park if it works out.
A couple of goals:
* Compatibility with the physical/electrical characteristics of the Adaptor.
* Able to be "Master" or "Slave " for the audio sampling.
* Support an external master clock, like a Si5351.
* Support experimentation in keeping the analog 3.3Volts quiet
The schematic:
The layout is at the part placement point and it looks like it will fit the board space on a 4-layer. There is no room for a headphone jack, so that would come from the J1 header. The headphone jack board would include the blocking capacitors and anti-pop resistors. The part layout:
Does anybody see problems/additions/subtractions, etc.? Thanks Bob W7PUA
This is at the point of putting down traces for the PCB, and I thought I would post this for "design review" comments. It might save a board cycle and also make something more useful to others. The plan is to share this on OSH Park if it works out.
A couple of goals:
* Compatibility with the physical/electrical characteristics of the Adaptor.
* Able to be "Master" or "Slave " for the audio sampling.
* Support an external master clock, like a Si5351.
* Support experimentation in keeping the analog 3.3Volts quiet
The schematic:
The layout is at the part placement point and it looks like it will fit the board space on a 4-layer. There is no room for a headphone jack, so that would come from the J1 header. The headphone jack board would include the blocking capacitors and anti-pop resistors. The part layout:
Does anybody see problems/additions/subtractions, etc.? Thanks Bob W7PUA