[sdiy] LFSR digital noise source

[bbob]

sometimes for the sound directly (crunchy/brittle), but more often slowing
the clock and then using it as a modulation source

On Sun, Nov 10, 2019 at 7:11 PM ColinMuirDorward <colindorward at gmail.com>
wrote:

> 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
>> >
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