[sdiy] LFSR digital noise source

[Tom Wiltshire]

*All* of ’em are LFSRs!

Different tap sequences for different uses, and one of them uses two different LFSRs with output bits interlaced, but they’re basically all LFSRs. The most sophisticated is the NOISE2 which produces pink noise using the Voos-McCartney algorithm (Thanks Richie!):

https://electricdruid.net/noise2-white-pink-noise-source/ <https://electricdruid.net/noise2-white-pink-noise-source/>

Short piece here about the various different designs:

https://electricdruid.net/which-noise-chip-do-i-need/

The code is available online if you want to program one up for your own use - you don’t have to buy a programmed chip.

Tom

==================
       Electric Druid
Synth & Stompbox DIY
==================

> On 10 Nov 2019, at 15:42, Pete Hartman <pete.hartman at gmail.com> wrote:
> 
> I'm not sure if any of them are LFSR, but electric druid has a number of different noise chips:
> 
> https://electricdruid.net/product-category/lfos-noise/ <https://electricdruid.net/product-category/lfos-noise/>
> 
> I also spent some time trying to build a DIP footprint equivalent to the 4006, using SMD 4015's and a couple other chips, but had trouble with it and have shelved it for quite some time now.  Eventually I'll get back to it. :)
> 
> Pete
> 
> 
> 
> 
> 
> On Sun, Nov 10, 2019 at 8:45 AM bbob <fluxmonk at gmail.com <mailto: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 <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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