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  • highly's Avatar
    01-17-2020, 10:59 PM
    Yep. It's the 10uF cap in the passive input filter. Here's an electrolytic vs a COG. My fail and probably what those with the OSH Park board are seeing given I used its BOM as a design reference. That's ~25dB difference...
    9 replies | 267 view(s)
  • highly's Avatar
    01-15-2020, 01:09 AM
    That looks great! I find it interesting that you split the ground planes across the CS42448. Do you have your MCLK running straight from the Teensy to the codec or are you doing anything to terminate the line? I'll...
    9 replies | 267 view(s)
  • highly's Avatar
    01-14-2020, 01:10 AM
    No worries. It's a lot of attenuation and quite unexpected. According to the datasheet, the highpass filter is -3dB at 1 Hz. The measurement device is an M-Audio Mobile Pre and though the specs don't give a...
    9 replies | 267 view(s)
  • highly's Avatar
    01-13-2020, 04:11 AM
    Thank you for the reply. I was reading that thread earlier today and it seems an interesting direction with many possibilities for I/O. I recognize that the codec has DC offset filters, but that graph indicates...
    9 replies | 267 view(s)
  • highly's Avatar
    01-12-2020, 09:01 PM
    I created a test audio board for a T4 project that isn't acting exactly as expected. This test board is modeled after Paul's OSH Park CS42448 multichannel TDM board. I followed the passive input and output...
    9 replies | 267 view(s)
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Custom TDM board - what did I do wrong? 01-17-2020 10:59 PM
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11-27-2019