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  • Blackaddr's Avatar
    07-10-2021, 12:03 PM
    I'm surprised the extra bit of polybleps math on the edge transitions are killing your performance. Maybe it's not implemented quite right? By re-writing polyBleps to eliminate division, or used fixed-point arithmetic,...
    6 replies | 197 view(s)
  • Blackaddr's Avatar
    07-07-2021, 10:53 AM
    Try turning off the CODEC's HPF. A number of codec have dynamic HPF that attempt to to remove the DC offset but the that that the filter is not static results in noise artefacts. The SGTL5000 does the exact same thing...
    1 replies | 116 view(s)
  • Blackaddr's Avatar
    07-02-2021, 12:37 PM
    If you're worried about damage, the problem isn't using headphone outputs to drive something you're not supposed (people do this all the time in the real world. Sometimes you break stuff, sometimes you don't). The real...
    8 replies | 290 view(s)
  • Blackaddr's Avatar
    06-26-2021, 12:20 PM
    Hi Frank, Congrats on building your board! When you switch to HB, and you get the interference, if you turn down the volume knob does it go away? Cheaper guitars aren't known for the best wiring or shield. So a...
    154 replies | 57093 view(s)
  • Blackaddr's Avatar
    06-11-2021, 03:07 PM
    I can also vouche to take a look at Chip's OpenAudio extentions rather than start from scratch. However, many effect developers also find it easier to simply convert to/from float in side their update() function and...
    6 replies | 418 view(s)
  • Blackaddr's Avatar
    06-09-2021, 12:51 PM
    As someone else mentioned, the program button is also available on header pins on the T4.1. I would highly recommend bringing this signal out to an enclosure mounted button. A small tactile switch like the kind use to...
    6 replies | 424 view(s)
  • Blackaddr's Avatar
    06-07-2021, 10:59 AM
    RA9 is not populated, I added the footprint in case I needed some frequency tweaking options, but didn't end up using it. The circuit structure between the op-amp and the ADC input on the TGA Pro is a passive...
    154 replies | 57093 view(s)
  • Blackaddr's Avatar
    06-06-2021, 11:18 AM
    Hi PerM, just to give you a heads up, the SNR of the ADC for the WM8731 is spec'd at 90dB. To convert this to bits, divide by 6db. 90 / 6 = 15 bits. (NOTE: 6db = a factor of 2, ie. one-bit). So the WM8731 will have...
    6 replies | 321 view(s)
  • Blackaddr's Avatar
    05-31-2021, 11:14 AM
    No idea, but there seems to be a dedicated IC for everything the days. I'm sure I've seen something, somewhere, sometime in relation to audio protection ICs. But it seemed overkill. The dual diode ICs I used in the TGA...
    4 replies | 335 view(s)
  • Blackaddr's Avatar
    05-31-2021, 11:10 AM
    Hi Frank, I still use the TL072. This is a very common op-amp used in guitar pedals and is very low-noise and allows for every high impedance input (very important for guitar). It's a great op-amp that's very easy...
    154 replies | 57093 view(s)
  • Blackaddr's Avatar
    05-30-2021, 02:26 PM
    Most codecs are designed for good performance at roughly around 1 Vrms as the normal operating point, however the SGTL5000 datasheet specs @ 3.3V supply a max input level of 2.83 Vpp. It's not clear if this is already...
    4 replies | 335 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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band limited oscillator with T3.2 07-10-2021 12:03 PM
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03-09-2017