<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">*All* of ’em are LFSRs!<div class=""><br class=""></div><div class="">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!):</div><div class=""><br class=""></div><div class=""><a href="https://electricdruid.net/noise2-white-pink-noise-source/" class="">https://electricdruid.net/noise2-white-pink-noise-source/</a></div><div class=""><br class=""></div><div class="">Short piece here about the various different designs:</div><div class=""><br class=""></div><div class=""><a href="https://electricdruid.net/which-noise-chip-do-i-need/" class="">https://electricdruid.net/which-noise-chip-do-i-need/</a></div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">Tom</div><div class=""><br class=""><div class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">==================<br class=""> Electric Druid<br class="">Synth & Stompbox DIY<br class="">==================</div></div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On 10 Nov 2019, at 15:42, Pete Hartman <<a href="mailto:pete.hartman@gmail.com" class="">pete.hartman@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">I'm not sure if any of them are LFSR, but electric druid has a number of different noise chips:<br class=""><br class=""><a href="https://electricdruid.net/product-category/lfos-noise/" class="">https://electricdruid.net/product-category/lfos-noise/</a><br class=""><br class="">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. :)<br class=""><br class="">Pete<br class=""><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 10, 2019 at 8:45 AM bbob <<a href="mailto:fluxmonk@gmail.com" class="">fluxmonk@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class="">anybody know of a digital noise circuit (similar to th ETI/Ken Stone design, <a href="http://www.synthpanel.com/modules/cgs31v10_digital_noise.html" target="_blank" class="">http://www.synthpanel.com/modules/cgs31v10_digital_noise.html</a>) 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.<div class=""><br class=""></div><div class="">b</div></div>
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