[sdiy] LFSR digital noise source

[ColinMuirDorward]

Hope this isn't too off topic, but I've often wondered when/why you'd
choose a digital noise source over an analog one. It is simply for the
acoustic flavour?

On Sun, Nov 10, 2019, 4:05 PM Ben Stuyts, <ben at stuyts.nl> wrote:

> That link points to the mil-spec version which is $15 each at 100 pcs. :-D
>
> Ben
>
> > On 11 Nov 2019, at 00:43, rsdio at audiobanshee.com wrote:
> >
> > It’s not really a complex shift register. All you really need is a set
> of Exclusive OR gates and a simple shift register of the desired length. If
> you can’t find a shift register that is long enough for your needs, you can
> simply cascade shorter shift registers. The only disadvantage of a discrete
> logic design is size. You can certainly tweak the taps if you have the
> shift registers and XOR gates as separate components.
> >
> > Note that Texas Instruments lists their CD4006 product as Active.
> >
> > http://www.ti.com/product/CD4006B-MIL
> >
> > Of course, this can be simulated in software, but that seems like
> serious overkill given how simple the basic gates are. I enjoy using
> processors for processing, but it’s way more fun to use discrete logic
> gates for pure logic functions.
> >
> > No matter which option you choose, I think that the signal conditioning
> from raw digital to analog would be a critical part of the design
> considerations.
> >
> > Brian
> >
> >
> >> On Nov 10, 2019, at 6:41 AM, bbob <fluxmonk at gmail.com> wrote:
> >> anybody know of a digital noise circuit (similar to th ETI/Ken Stone
> design, http://www.synthpanel.com/modules/cgs31v10_digital_noise.html)
> that does not use the out-of-production CD4006?  Seems like you should be
> able to cobble together a complex shift register like that out of other
> still-available chips, but i'm not savvy enough on digital logic to do it
> myself.
> >>
> >> b
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at synth-diy.org
> > http://synth-diy.org/mailman/listinfo/synth-diy
> >
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20191110/e9bc5285/attachment.htm>