[sdiy] 20ms delay? analog allpass filter?

[Mikko Helin]

This one doesn't even need i2c controller, it's got two 3-state input
pins for delay time control:
https://www.semiee.com/file/EOL2/Renesas-R2S15901SP.pdf
Might be difficult to source. TPA5052 from TI is similar. That said I
think using RPi Pico you could implement similar one yourself.

On Fri, Feb 10, 2023 at 12:10 PM Mikko Helin <maohelin at gmail.com> wrote:
>
> Even with the digital solution you don't need DSP as there are some
> I2S lip sync delays you can control using a simple Arduino
> microcontroller (or RPi Pico), in addition you just need a codec board
> (from Ebay etc.) and that I2S delay like this one (TI's TPA5050):
> https://www.ti.com/lit/ds/symlink/tpa5050.pdf?ts=1675998263024
>
> On Thu, Feb 9, 2023 at 3:43 PM René Schmitz <synth at schmitzbits.de> wrote:
> >
> >
> > Am 09.02.2023 um 14:18 schrieb Ben Stuyts:
> >
> >
> > I guess one can say that in the 1930s Hammond did a mechanical way, because that was doable.
> >
> >
> > That just reminded me that I have an old Schaller Rotor Sound which does something similar with a ton of inductors. See attached schematic.
> >
> >
> > That looks crazy. It looks they're saturating the cores, and thus varying the delay time of the transmission line magnetically.
> >
> >
> > Best,
> >
> >  René
> >
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