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  • Blackaddr's Avatar
    07-12-2019, 12:02 AM
    Assuming the SSOP part, Pin 22 (CSB) of the WM8731 controls the I2C address. Pin 21 (MODE) controls whether it is I2C or SPI control interface. For two WM8731s, pull or tie the MODE pin low on both chips to select I2C,...
    4 replies | 95 view(s)
  • Blackaddr's Avatar
    06-29-2019, 10:41 AM
    Kicad is great
    11 replies | 371 view(s)
  • Blackaddr's Avatar
    06-20-2019, 12:49 PM
    Yes, use a sine wave. When I made my chorus I got it working glitch free with a sinewave first, then moved on to investigating ways of bandlimiting the other waveforms like triangle.
    7 replies | 400 view(s)
  • Blackaddr's Avatar
    06-18-2019, 01:11 PM
    Don't worry! We're hear to help. You might also want to try something dead simple first. Rather than designing a proper BiQuad IIR filter, what about just a 1st order IIR where you have // Simple 1st order IIR,...
    7 replies | 400 view(s)
  • Blackaddr's Avatar
    06-18-2019, 01:55 AM
    You can't use a raw triangle wave as a modulation source directly, it will cause glitching because a perfect triangle has infinite bandwidth due to discontinuities at the peaks/troughs. This infinite bandwidth causes...
    7 replies | 400 view(s)
  • Blackaddr's Avatar
    06-18-2019, 12:56 AM
    Earlier this year I was working on a chorus for my BALibrary. In order to get the chorus sounding right with no glitches, I had to do exactly what Chip says here. You cannot use a static delay value for each audio...
    20 replies | 697 view(s)
  • Blackaddr's Avatar
    05-28-2019, 11:28 AM
    What types of sources to you plan to connect as audio inputs, and what you want to connect the output to?
    11 replies | 548 view(s)
  • Blackaddr's Avatar
    05-27-2019, 12:04 PM
    Hi Paul, I'm not quite sure exactly which "ext" in the schematic you're referring to? Here's a summary of a couple items for Bob's benefit, but let me know if I'm stilling missing the "ext" you were asking about. ...
    11 replies | 548 view(s)
  • Blackaddr's Avatar
    05-27-2019, 12:47 AM
    I also did a WM8731 audio board for the Teensy. Mine is significantly larger because I added a lot more functionality including a preamp (to support instrument/mic level inputs), MIDI and connectors. Regarding noise, it...
    11 replies | 548 view(s)
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About Blackaddr

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About Blackaddr
Biography:
Engineer by day, Maker by night.
Location:
Canada
Interests:
Guitar Digital Modelling
Occupation:
Engineer

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Quad Channel with WM8731 07-12-2019 12:02 AM
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03-09-2017